15. what is the ph of the solution when 0.003 moles of hcl is added to a 30.00 ml buffer solution that contains 0.015 moles of hcooh and 0.015 moles of na hcoo? ka

Answers

Answer 1

The pH of the solution when 0.003 moles of HCl is added to a 30.00 ml buffer solution that contains 0.015 moles of HCOOH and 0.015 moles of NaHCOO is 3.02.

What is a buffer solution?

A buffer solution is a solution that resists changes in pH when small amounts of acids or bases are added to it. When acids or bases are added to it, the buffer solution can either accept or donate protons, limiting any increase or decrease in pH. Buffer solutions are usually made by mixing a weak acid and its corresponding salt or a weak base and its corresponding salt in a specific proportion to achieve a specific pH.

The equation for the dissociation of formic acid (HCOOH) is:

HCOOH(aq) + H₂O(l) ⇌ H₃O+(aq) + HCOO-(aq)

The Ka expression for formic acid is:

Ka = [H₃O+] [HCOO-]/[HCOOH]

A buffer solution consists of a weak acid (HCOOH) and its corresponding salt (NaHCOO). When the salt dissolves in water, it hydrolyzes to form Na+ and HCOO-. The Na+ ions are spectator ions and do not take part in the equilibrium reaction.

The hydrolysis reaction is:

HCOO-(aq) + H₂O(l) ⇌ H₃O+(aq) + HCOO-(aq)

The equilibrium constant expression for this reaction is:

Kb = [HCOO-][H₃O+]/[HCOOH]

Since Ka × Kb = Kw,

where

Kw is the ion product constant for water,

Kw = [H₃O+][OH-] = 1.0 × 10-14

Ka × Kb = [H₃O+][HCOO-]/[HCOOH][HCOO-][H₃O+] = Ka × [HCOOH][HCOO-][H₃O+] = 1.0 × 10-14[H₃O+] = [HCOO-][HCOOH]/Ka[H₃O+] = 10^-3.52 = 2.51 × 10^-4

pH = -log[H₃O+]

pH = -log(2.51 × 10⁻⁴) = 3.02

Hence, the pH of the solution when 0.003 moles of HCl is added to a 30.00 ml buffer solution that contains 0.015 moles of HCOOH and 0.015 moles of NaHCOO is 3.02.

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Related Questions

the ions in calcium chloride dissociate in the presence of water. what is the cation that is produced in this reaction?

Answers

The cation that is produced when calcium chloride dissociates in the presence of water is Ca²⁺.

In the presence of water, calcium chloride dissociates into its constituent ions:

CaCl₂(s) + H₂O(l) → Ca²⁺(aq) + 2Cl⁻(aq)

As seen from the equation, the cation which is produced when calcium chloride dissociates in the presence of water is Ca²⁺.

Calcium chloride (CaCl₂) is a chemical compound that is commonly used in a variety of applications, such as in de-icing and dust control, as a food additive, and in water treatment.

It is a white crystalline solid that is highly soluble in water and has a salty taste. When calcium chloride is dissolved in water, it dissociates into calcium cations (Ca²⁺) and chloride anions (Cl⁻), making it an electrolyte. Calcium chloride is also used in the production of cement and as a desiccant to remove moisture from the air.

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100 POINTS! Please help! (silly answers will be reported)

How many grams of NO2 can be produced from 15.0 g of NO and 5.60 g of O2 according to the equation:

2 NO + O2
2NO2

Answers

According to the balanced chemical equation you provided, 2 moles of NO react with 1 mole of O2 to produce 2 moles of NO2. The molar mass of NO is 30.01 g/mol and the molar mass of O2 is 32.00 g/mol. This means that 15.0 g of NO is equivalent to 0.5 moles and 5.60 g of O2 is equivalent to 0.175 moles.
Since the ratio of NO to O2 in the reaction is 2:1, the limiting reactant in this case is O2. This means that all of the available O2 will be consumed in the reaction and only 0.35 moles (0.175 x 2) of NO will be consumed.
The molar mass of NO2 is 46.01 g/mol, so 0.35 moles of NO2 has a mass of approximately 16.1 grams.
Approximately 16.1 grams of NO2 can be produced from the given amounts of NO and O2.

Answer:

16.1 g

Explanation:

We want to find how many grams of NO₂ can be produced from 15.0 g of NO and 5.60 g of O₂ according to the balanced chemical equation:

[tex]\sf 2 NO + O_2\;\; \longrightarrow \;\;2NO_2[/tex]

First, convert the given masses of both reactants, NO and O₂, to moles using their respective relative formula masses [tex]\sf(M_r)[/tex].

Relative formula masses:

[tex]\sf M_r\;of\;NO: 30.01\;g/mol[/tex][tex]\sf M_r \; of\; O_2: 31.999\;g/mol[/tex]

Therefore:

[tex]\sf moles\;of\;NO=\dfrac{mass\;(g)}{M_r}=\dfrac{15.0}{30.01}=0.500[/tex]

[tex]\sf moles\;of\;O_2=\dfrac{mass\;(g)}{M_r}=\dfrac{5.60}{31.999}=0.175[/tex]

Now look at the ratio of the reactants:

2 mol NO : 1 mol O₂ = 0.5 mol NO : 0.25 mol O₂

There are only 0.175 moles of O₂ (instead of 0.25 moles), so the O₂ will run out first. It is the limiting reactant.

Use the moles of the limiting reactant to calculate the mass of the product, remembering to use the molar ratio between the limiting reactant and the product.

Limiting reactant : product = 1 mol O₂ : 2 mol NO₂

Therefore, 0.175 mol O₂ will make 0.35 mol NO₂.

Finally, convert the moles of NO₂ to grams:

[tex]\begin{aligned}\sf Mass\;of\; NO_2 &= \sf moles \times M_r \\&= \sf 0.35 \times 46.0055\\ &= \sf 16.1\; g\end{aligned}[/tex]

Please help me with this chemistry problem PLEASE!!

Answers

The theoretical yield of NH₄NO₃  in grams is 49.03 g (rounded to two decimal places).

nitrogen gas:

Convert the volume of nitrogen gas to moles using the ideal gas law: PV = nRT.

P = 1 atm (standard pressure), V = 16608 L, T = 20°C + 273.15 = 293.15 K, R = 0.08206 L·atm/mol·K

n = PV/RT = (1 atm)(16608 L)/(0.08206 L·atm/mol·K)(293.15 K) = 693.8 moles

Use the balanced chemical equation to determine the amount of product formed by nitrogen gas: 2 moles of N2 react to form 2 moles of NH₄NO₃ .

So, 693.8 moles of N2 would form 693.8/2 = 346.9 moles of NH₄NO₃ .

oxygen gas:

Convert the volume of oxygen gas to moles using the ideal gas law: PV = nRT.

P = 1 atm (standard pressure), V = 7.2123 L, T = 20°C + 273.15 = 293.15 K, R = 0.08206 L·atm/mol·K

n = PV/RT = (1 atm)(7.2123 L)/(0.08206 L·atm/mol·K)(293.15 K) = 0.3069 moles

Use the balanced chemical equation to determine the amount of product formed by oxygen gas: 1 mole of O2 reacts to form 2 moles of NH₄NO₃ .

So, 0.3069 moles of O2 would form 0.3069 x 2 = 0.6138 moles of NH₄NO₃ .

water:

Convert the volume of water to mass using its density:

Mass = Volume x Density = 7.2310 L x 1.00 kg/L x 1000 g/kg = 7231 g

Use the balanced chemical equation to determine the amount of product formed by water: 4 moles of H₂O react to form 2 moles of NH₄NO₃ .

So, 7231 g of H2O would form (2/4) x (7231 g/18.015 g/mol) = 201.2 moles of NH₄NO₃ .

Since oxygen gas forms the least amount of product, it is the limiting reactant. Therefore, we will use the amount of NH₄NO₃  formed by oxygen gas to calculate the theoretical yield.

The molar mass of NH₄NO₃  is 80.0434 g/mol.

The amount of NH₄NO₃  formed by oxygen gas is 0.6138 moles.

Therefore, the theoretical yield of NH₄NO₃  is (0.6138 mol) x (80.0434 g/mol) = 49.03 g.

The theoretical yield of NH₄NO₃ in grams is 49.03 g (rounded to two decimal places).

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which fabric dyed with american flag red displayed the most vivid color? explain why you choose that fabric type and discuss, using intermolecular forces, the reasoning behind your observations

Answers

The fabric that is dyed with American flag red that displayed the most vivid color is the cotton fabric. This is due to the fact that cotton has a high affinity for the dye molecules. The fabric also has a strong and large intermolecular force that helps in binding with the dye molecules. This strong intermolecular force increases the depth of color for the cotton fabric.  

Intermolecular forces are forces that exist between molecules or atoms. These forces govern the physical properties of matter. The types of intermolecular forces are dipole-dipole forces, hydrogen bonds, van der Waals forces, ion-dipole forces, and London dispersion forces.

Dipole-dipole forces are forces that exist between polar molecules. These forces exist between the partially positive end of one molecule and the partially negative end of another molecule.  Hydrogen bonds are forces that exist between molecules that contain hydrogen and a strongly electronegative atom such as oxygen or nitrogen.  Van der Waals forces are forces that exist between nonpolar molecules. These forces are weak and are caused by temporary dipoles that are created in the molecules.  Ion-dipole forces are forces that exist between ions and polar molecules.  London dispersion forces are forces that exist between all molecules, both polar and nonpolar.

These forces are weak and are caused by temporary dipoles that are created in the molecules.

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i need help with this problem i been stuck on it for a while now i need your help

Answers

Answer:

How should viruses be classified - as living or non-living?

Explanation:

What is the correct net ionic equation to describe this precipitation reaction?Co(NO3)2(aq)+2NaOH(aq)⟶2NaNO3(aq)+Co(OH)2(s)Co(NOX3)X2(aq)+2NaOH(aq)⟶2NaNOX3(aq)+Co(OH)X2(s)

Answers

The correct net ionic equation for the given ionic equation is,

Co²⁺+ (aq) + 2 OH⁻⁻ (aq) → Co(OH)₂ (s)

Generally the net ionic equation is defined as a chemical equation for a reaction that counts only those species participating in the reaction. Basically the net ionic equation is mostly used in acid-base neutralization reactions, double displacement reactions, and redox reactions.

HCl, NaOH, and NaCl are some examples of strong electrolytes. As these electrolytes, completely dissociates into their ions in solution, and although it may written that "HCl" we really mean "H+ + Cl–". Also, "NaOH" is "Na+ + OH–" and "NaCl" is "Na+ + Cl–".

Hence, the correct net ionic equation for the given ionic equation is Co²⁺+ (aq) + 2 OH⁻⁻ (aq) → Co(OH)₂ (s).

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calculate the mass of sodium acetate (nach3coo) required to prepare 50.0 ml of a 0.10 m sodium acetate solution, the molar mass of nach3coo is 82.03 g/mol

Answers

The mass of sodium acetate (CH₃COONa) required to prepare 50.0 ml of a 0.10 m sodium acetate solution is 0.41g.

0.10 M aqueous solution of sodium acetate means that 1000 mL of a solution containing 0.10 moles of sodium acetate.

1 ml of solution = 0.10moles

∴No. of moles of sodium acetate in 50mL

= (0.10/1000)×50

= 0.005

Number of moles is calculated as

=Mass given/ Molecular mass

The molar mass of sodium acetate = 82.03g/mol

∴Mass of sodium acetate acquired

=no of moles of sodium acetate × molar mass of sodium acetate

= 0.005 mol ×82.03 g/mol

= 0.41 g

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I need help with this!! it’s due by the end of the day


The second question asks “What is the percentage of water in the hydrated sample?”

Answers

A. The number of moles of water that were absorbed is 0.094 mole

B. The percentage of water in the hydrate is 25.4%

1. How do i determine the mole of water?

The number of mole water absorbed can be obtain as follow:

Mass increase = 1.70 grams Mass of water = Mass increase = 1.70 grams Molar mass of water = 18 g/mol Mole of water =?

Mole = mass / molar mass

Mole of water = 1.70 / 18

Mole of water = 0.094 mole

B. How do i determine the percentage of water?

We can obtain the percentage of water as follow:

Mass of water = 1.70Mass of anhydrous = 5.00 gramsMass of hydrate = 11.7 + 5 = 6.7 gramsPercentage of water =?

Percentage of water = (mass of of water / mass of hydrate) × 100

Percentage of water = (1.7 / 6.7) × 100

Percentage of water = 25.4%

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A solution is tested with litmus paper and its pH value is 3. 34. What color does litmus paper turn in this solution? 35. What is the hydronium ion concentroation of this solution? 36. What is the hydroxide ion concentration of this solution? 37. What is the pOH value of this solution is 3​

Answers

The pOH value can be calculated by taking the negative log of the hydroxide ion concentration, which gives -log(2.12 x 10^-11) = 10.67. Since pH + pOH = 14, we can calculate the pH value as 14 - 10.67 = 3.33, which matches the initial pH value of the solution in question.

PROVIDE 3 REASONS THESE EROSION RATES MAY HAVE DROPPED DURING THE TIME PERIOD GIVEN

Answers

The three possible reasons why erosion rates may have dropped during the time period given are more likely due to Conservation practices, Land-use changes and Technological advances.

Here are three possible reasons why erosion rates may have dropped during the time period given:

1. Conservation practices: There has been increased adoption of conservation practices on agricultural lands, such as conservation tillage, cover cropping, and terracing, which reduce soil erosion rates.

These practices help to conserve soil moisture, promote soil health, and minimize soil disturbance, all of which help to reduce erosion rates.

2. Land-use changes: Land-use changes may have led to a reduction in erosion rates. For example, the conversion of marginal cropland to permanent vegetation cover, such as grassland or forest, can significantly reduce erosion rates.

Additionally, the reduction in tillage practices for crop production and the use of perennial crops with deeper roots can help to stabilize soils and reduce erosion rates.

3. Technological advances: Technological advances in soil conservation practices, such as the development of precision agriculture and real-time weather monitoring, have also contributed to the reduction in erosion rates.

These advances enable farmers to tailor their agricultural practices to site-specific conditions, thereby minimizing soil erosion rates.

For example, precision agriculture technologies can be used to optimize fertilizer and pesticide applications, reducing soil disturbance and runoff, while real-time weather monitoring allows farmers to adjust their practices in response to changing weather conditions.

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what is the activation energy for the isomerization of methyl isocyanide?

Answers

The activation energy for the isomerization of methyl isocyanide is 198 kJ/mol.

Isomerization is a chemical reaction in which a molecule undergoes a structural rearrangement without being broken down into smaller molecules. The activation energy is the energy that must be supplied to a chemical reaction to begin. It is a measure of the reaction's difficulty to begin.

Methyl isocyanide is a chemical compound that is a colorless gas with a powerful odor. It is a linear molecule with the chemical formula CH₃NC. This compound is of interest because of its unusual reactivity and its ability to form a stable complex with transition metals in coordination chemistry.

In the case of methyl isocyanide, the reaction pathway involves the rearrangement of a single bond from C-N to N-C. The energy required for this transformation, including the necessary breaking and formation of bonds, is known as the activation energy. It is this energy barrier that must be overcome for the reaction to proceed.

Thus, the activation energy of the isomerization of methyl isocyanide is 198 kJ/mol. This is a relatively high energy requirement, indicating that the reaction is unlikely to occur under normal conditions without additional energy input.

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a certain cold remedy is a large tablet that is added to a glass of water. while the tablet dissolves in water, it releases a lot of bubbles. is a chemical or a physical change occurring? how can you tell?

Answers

When a large tablet dissolves in water, releasing a lot of bubbles, it is a: chemical change occurs.

The dissolved tablet changes the chemical composition of the water. Here's a step-by-step explanation:

When a large tablet is added to water, it begins to dissolve in the water. This process is known as a physical change because no new substance has been formed. However, the large tablet is made up of chemicals that are reacting with the water as it dissolves. As the chemicals react, they produce a lot of bubbles.

The bubbles are formed because of a chemical reaction that occurs when the tablet dissolves. As the chemicals in the tablet react with the water, they release gases such as carbon dioxide. The carbon dioxide gas is what causes the bubbles to form.

The chemical reaction that takes place between the chemicals in the tablet and the water is irreversible, meaning that a new substance is formed. The tablet dissolving in water is a great example of a chemical change because a new substance is formed when the chemicals in the tablet react with the water.

In this case, the bubbles are a byproduct of the chemical reaction that takes place when the tablet dissolves. Therefore, the release of bubbles during the dissolving of the tablet is an indication of a chemical change.

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a second student makes a buffer by dissolving 0.100 mol of nano2(s) in 100. ml of 1.00 m hno2(aq). which is more resistant to changes in ph when a strong acid or a strong base is added, the buffer made by the second student or the buffer made by the first student in part (c)? justify your answer.

Answers

The buffer solution made by second student is more resistant to changes in pH when a strong acid or a strong base is added.

Generally buffer solution is defined as a water solvent based solution that consists of a mixture which contains a weak acid and also the conjugate base of the weak acid, or a weak base and also the conjugate acid of the weak base. Basically buffer solution are capable of resisting a change in pH upon dilution or upon the addition of small amounts of acid/alkali to them.

Here, the concentration of the second student is 10 times higher than the first student and due to this it has a greater capacity to neutralize acids and bases.

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based on the definition of a mineral, being a naturally occurring solid, formed by inorganic processes, with a characteristic crystal structure and s specific chemical composition, which materials will be classified as minerals?

Answers

Based on the definition of a mineral, being a naturally occurring solid, formed by inorganic processes, with a characteristic crystal structure and a specific chemical composition, materials that will be classified as minerals are those that meet the given criteria.

What are minerals?

A mineral is a naturally occurring, solid, crystalline substance that is inorganic in nature and has a distinct chemical composition. Minerals are typically formed by geological processes that occur over a long period of time. Minerals are composed of atoms and molecules that are arranged in a regular, three-dimensional pattern, known as a crystal structure. Because minerals are formed under specific conditions, they have distinct physical and chemical properties.

There are numerous minerals in the earth's crust, and they can be identified based on their physical and chemical properties. Mineralogists study minerals and their properties in order to better understand the earth's composition and history.

Mineral resources are commonly used for industrial purposes such as construction, fuel, and electronics.

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Please help me with this chemistry problem PLEASE!!

Answers

The theoretical yield of [tex]NH_4NO_3[/tex] in grams is 52,856 g or 52.9 kg.

To determine the theoretical yield of the limiting reactant in grams, we need to follow these steps:

Calculate the moles of each reactant using the ideal gas law: PV = nRT, where P is pressure, V is volume, n is moles, R is the gas constant, and T is the temperature in Kelvin.

For nitrogen gas (N2):

n = PV/RT = (1 atm) * (16608 L) / [(0.08206 L atm/mol K) * (293.15 K)] = 660.5 mol

For oxygen gas (O2):

n = PV/RT = (1 atm) * (7.2123 L) / [(0.08206 L atm/mol K) * (293.15 K)] = 0.2876 mol

For water (H2O):

n = PV/RT = (1 atm) * (7.2310 L) / [(0.08206 L atm/mol K) * (293.15 K)] = 0.2891 mol

Determine the limiting reactant by comparing the moles of each reactant to the stoichiometry of the balanced chemical equation. We can see from the equation that 2 moles of N2 react with 1 mole of O2 and 4 moles of H2O, so the mole ratio of N2 to O2 is 2:1 and the mole ratio of N2 to H2O is 2:4 or 1:2. Therefore, N2 is the limiting reactant since it has the smallest number of moles.

Calculate the moles of [tex]NH_4NO_3\\[/tex] produced by using the mole ratio between N2 and [tex]NH_4NO_3[/tex]. From the balanced chemical equation, we see that 2 moles of N2 produce 2 moles of[tex]NH_4NO_3[/tex]. Therefore, the number of moles of [tex]NH_4NO_3[/tex] produced is equal to the number of moles of N2:

moles of [tex]NH_4NO_3[/tex]= 660.5 mol

Convert the moles of [tex]NH_4NO_3[/tex] to grams using its molar mass. The molar

mass of NH₄NO₃ is 80.0434 g/mol.

mass of NH₄NO₃ = moles of NH4NO3 x molar mass of NH4NO3

mass of NH₄NO₃ = 660.5 mol x 80.0434 g/mol

mass of NH₄NO₃ = 52,856 g or 52.9 kg

Therefore, the theoretical yield of NH₄NO₃ in grams is 52,856 g or 52.9 kg.

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The cytosol makes proteins true or false

Answers

Certain RNAs coordinate the synthesis of proteins at ribosomes, which are structures found in the cytoplasm.

Correct option is , True.

Do proteins get made in the cytosol?

Every protein starts its production in the cytoplasm. Nonetheless, some are moved to other cellular locations while the majority remain there permanently. Some molecules are entirely produced in the cytoplasm.

What roles do the proteins in the cytosol play?

It takes part in the signalling process that occurs between the nucleus, organelles, and cell membrane. It transports metabolites from the cell's production site to other parts of the body. It is critical that a cell divides throughout cytokinesis or mitosis. The cytoplasm is involved in eukaryote metabolism.

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write word problem for 6ml of 3% h2o2 in a clean test tube, add a tiny amount of mno2 to test tube and loosely stopper the tube, after 15-20 seconds hold at 45

Answers

The resulting solution will contain 0.18 mL of MNO2 and be 0.01% in concentration.

To solve this problem, let's first set up the equation:
6 mL * 3% H2O2 = X mL * Y% MNO2
Next, let's solve for X and Y:
X = 6 mL * 3% = 0.18 mL
Y = 0.18 mL / 6 mL * 3% = 0.01%
Now that we have X and Y, we can answer the question.
Given 6 mL of 3% H2O2 in a clean test tube, add a tiny amount of MNO2 to the test tube and loosely stopper the tube. After 15-20 seconds, hold the tube at 45 degrees. The resulting solution will contain 0.18 mL of MNO2 and be 0.01% in concentration.

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a solenoid is 1.8 m long and has 450 turns per meter. what is the cross-sectional area of this solenoid if it stores 0.39 j of energy when it carries a current of 12 a?

Answers

The cross-sectional area of the solenoid is approximately 2.84 × 10\-4 m\2. To find the cross-sectional area of the solenoid, we need to follow these steps:

1. Calculate the total number of turns in the solenoid.
2. Determine the inductance of the solenoid.
3. Calculate the cross-sectional area using the formula for the inductance of a solenoid.

Step 1: Calculate the total number of turns in the solenoid.
Total turns (N) = turns per meter (n) * length (L)
N = 450 turns/m * 1.8 m
N = 810 turns

Step 2: Determine the inductance of the solenoid.
The energy stored in the solenoid (W) can be calculated using the formula:
W = 0.5 * L * I\2
where L is the inductance and I is the current.

Rearrange the formula to find the inductance:
L = 2 * W / I^2
L = 2 * 0.39 J / (12 A)\2
L = 0.078 H (henry)

Step 3: Calculate the cross-sectional area using the formula for the inductance of a solenoid.
The inductance of a solenoid can be calculated using the formula:
L = μ₀ * N\2 * A / L
where μ₀ is the permeability of free space (4π × 10\-7 T·m/A), A is the cross-sectional area, and L is the length.

Rearrange the formula to find the cross-sectional area:
A = L * L / (μ₀ * N\2)
A = 0.078 H * 1.8 m / (4π × 10\-7 T·m/A * (810 turns)\2)
A ≈ 2.84 × 10\-4 m^2

The cross-sectional area of the solenoid is approximately 2.84 × 10\-4 m\2.

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Vinegar is a solution of acetic acid. What is the molarity of the solution produced
when 2.08 mol of acetic acid is dissolved in sufficient water to prepare 15 mL of
solution?
13.9 M
1.39 M
139 M
0.139 M

Answers

It's more common to prepare acetic acid solutions with concentrations in the range of 0.1 to 1.0 M.

What is Acetic Acid?

Acetic acid is an organic acid with the chemical formula CH3COOH. It is a clear, colorless liquid with a pungent odor and sour taste. It is also known as ethanoic acid and is the main component of vinegar, which is typically composed of 5-20% acetic acid by volume.

To calculate the molarity of a solution, we need to know the number of moles of solute and the volume of the solution in liters.

In this case, we are given the number of moles of acetic acid (2.08 mol) and the volume of the solution (15 mL or 0.015 L). We can use the formula for molarity:

Molarity = moles of solute / volume of solution (in liters)

Molarity = 2.08 mol / 0.015 L = 139 M

Therefore, the molarity of the solution produced is 139 M. However, it's important to note that this concentration is extremely high and not practical or feasible for most laboratory or industrial purposes.

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help me plesa.Which of the following are examples of negative tropism? (Select all that apply.)
a plant’s stem growing upward out of the ground
a plant’s leaves growing away from the sunlight
a plant’s leaves growing toward the direction of the sun
a plant’s roots growing down into the soil

Answers

Examples of negative tropism would be:

A plant’s leaves growing away from the sunlightA plant’s roots growing down into the soil

What is negative tropism?

Negative tropism is the growth or movement of a plant away from a stimulus, such as light or gravity.

In the case of the examples given, the plant's leaves growing away from the sunlight is an example of negative phototropism, while the plant's roots growing down into the soil is an example of negative geotropism.

Thus, the two examples of negative tropism are:

A plant’s leaves growing away from the sunlightA plant’s roots growing down into the soil

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48L of hydrogen gas is heated from -20c to 90c and the pressure is decreased from 760 mmHg to 740 month. What Is the final volume?

Answers

Answer:

To solve this problem, we can use the combined gas law, which states that (P1 * V1) / T1 = (P2 * V2) / T2, where P is pressure, V is volume, and T is temperature in kelvins.

First, we need to convert the temperatures from Celsius to kelvins by adding 273.15. So -20°C is equivalent to 253.15 K and 90°C is equivalent to 363.15 K.

Plugging in the known values into the combined gas law formula, we get:

(760 * 48) / 253.15 = (740 * V2) / 363.15

Solving for V2, we find that the final volume of the hydrogen gas is approximately 53.7 L.

1. Predict the types of
intermolecular forces that may act between
the molecules in these substances.
a. CO₂
b. NH,
c. HCI
d. C,H,

Answers

a. Due to the non-polar nature of CO2 molecules, London dispersion forces are the only intermolecular forces that may interact with them.

b. Due to the presence of a nitrogen atom with a single pair of electrons, NH3 molecules are polar and are capable of both hydrogen bonding and dipole-dipole interactions.

c. Due to their polar nature, HCl molecules are capable of both hydrogen bonding and dipole-dipole interactions.

d. Since C6H6 (benzene) molecules are non-polar, London dispersion forces are the only intermolecular forces that can act between them.

which of the following is not one of the forms of vitamin a in your body and in food listed in the video? a.retinol b.retinoic acid c.retinal d.retinase e.retinyl esters

Answers

Retinase. Vitamins don't help to raise how many calories or how much energy the human body needs.

What three forms does vitamin A come in?

Dietary supplements that contain vitamin A are often preformed vitamin A in the form of retinyl acetate or retinyl palmitate, provitamin A in the form of beta-carotene, or a combination of preformed and provitamin A.

What variations of vitamin A are there in the body?

Preformed vitamin A (retinol, retinyl esters) and provitamin A carotenoids like alpha- and beta-carotene that are converted to retinol are the two main forms of vitamin A in the human diet. Animal products, fortified meals, and vitamin supplements are sources of preformed vitamin A.

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the slope of the titration curve near the equivalence point is steep group of answer choices true false

Answers

It is true that the slope of titration curve near equivalence point is steep.

How is the slope of the titration curve near the equivalence point?

The slope of the titration curve near the equivalence point is steep because there is a rapid change in pH with the addition of small amount of titrant. At the equivalence point, all the analyte has reacted with titrant, and the solution contains only salt and water. Any further addition of titrant causes a rapid increase in pH . The steepness of slope depends on the strength of acid and base involved, as well as their concentrations.

The point at which chemically equivalent quantities of reactants have been mixed is known as equivalence point of a chemical reaction .

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How are creating triglycerides from fatty acids and glycerol?

Answers

Triglycerides are formed by a process called esterification, in which fatty acids react with glycerol to form a molecule of triglyceride and three molecules of water. This process is catalyzed by enzymes known as lipases.

The chemical equation for the esterification of one molecule of glycerol with three molecules of fatty acid is as follows:

3 Fatty Acids + Glycerol → Triglyceride + 3 Water molecules

In this reaction, each of the three fatty acid molecules undergoes a condensation reaction with one of the hydroxyl (-OH) groups of the glycerol molecule.

This results in the formation of an ester bond between the fatty acid and the glycerol, and the release of one molecule of water. The reaction is repeated three times, resulting in the formation of a triglyceride molecule.

Triglycerides are a type of lipid that are stored in adipose tissue and serve as a source of energy for the body. They can be broken down by enzymes called lipases to release fatty acids and glycerol, which can then be used as a source of energy by the body.

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help asap please 50 points !!!!

Which of the following will always produce a magnetic force on a nearby iron nail?

O a long piece of copper wire

O a large static electric charge

O an electric current

O an electric field​

Answers

Answer: An electric current

Explanation:

As there is magnetic effect of electric current i.e when there is an electric current passing through any conductor then is produces a magnetic field around it depending on its shape. so due to magnetic field and a current there will be a magnetic force applied.  

during a firework show the white incandescent light is produced by the following reaction. P+O2->P4O10. if a chemical uses 8.00 grams of oxygen in an excess of phosphorus how many grams of P4O10 will the chemist make

Answers

14.2g of [tex]P_4O_{10}[/tex] will be made by the chemist when a chemical uses 8.00 grams of oxygen in an excess of phosphorus.

Given the white incandescent light is produced during a firework show

The reaction is as follows:[tex]P + O_2 - > P_4O_{10[/tex]

After balancing the equation we get:[tex]4P + 5O_2 -- > P_4O_{10[/tex]

The mass of oxygen used = 8g

From the reaction we can see that 5 moles of Oxygen ([tex]O_2[/tex]) react with phosphorous to form 1 mole of [tex]P_4O_{10[/tex].

Mass of oxygen used initially = moles x molar mass of [tex]O_2[/tex] = 5 * 32 = 160g

mass of [tex]P_4O_{10[/tex] used = 1 mole x 284g/mole = 284g

for 160g of oxygen 284g of [tex]P_4O_{10[/tex] is produced.

Then for 8g of oxygen = 8 * 284/160 = 14.2g of [tex]P_4O_{10[/tex] is obtained.

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a mixture of gases contains 0.31 mol ch 4 , 0.25 mol c 2 h 6, and 0.29 mol c 3 h 8. the total pressure is 1.50 atm. calculate the partial pressures of the gases

Answers

The partial pressures of each gas in the mixture are: 0.325 atm for CH4, 0.263 atm for C2H6, and 0.412 atm for C3H8.

To calculate the partial pressure of each gas, we need to first find the total moles of gas in the mixture. The total moles can be calculated by adding up the moles of each gas:

Total moles = 0.31 mol CH₄ + 0.25 mol C2H₆ + 0.29 mol C3H₈ = 0.85 mol

Next, we can calculate the mole fractions of each gas:

Mole fraction of CH₄ = 0.31 mol / 0.85 mol = 0.365

Mole fraction of C2H₆ = 0.25 mol / 0.85 mol = 0.294

Mole fraction of C₃H₈ = 0.29 mol / 0.85 mol = 0.341

Finally, we can calculate the partial pressures of each gas by multiplying the mole fraction by the total pressure:

Partial pressure of CH₄ = 0.365 x 1.50 atm = 0.325 atm

Partial pressure of C₂H₆ = 0.294 x 1.50 atm = 0.263 atm

Partial pressure of C₃H₈ = 0.341 x 1.50 atm = 0.412 atm

Therefore, the partial pressures of each gas in the mixture are: 0.325 atm for CH₄, 0.263 atm for C2H₆, and 0.412 atm for C₃H₈.

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After determining the amount of moles required for one of the reactants, it was shown that was the limiting reactant and was the excess reactant.

Answers

When one of the reactants is identified as the limiting reactant and the other as the excess reactant, the limiting reactant will be entirely consumed by the reaction, while part of the surplus reactant will be left over.

The greatest amount of product that can be created from the specified amounts of reactants is determined by this crucial stoichiometric notion.

In the balanced chemical equation, compare the amounts of each reactant and their associated stoichiometric coefficients to identify which reactant is the limiting reactant.

As it will be consumed entirely before the other reactant, the limiting reactant is the one with the lower necessary number of moles for the reaction.

Stoichiometry can be used to determine how much of the limiting reactant can be converted into the product once it has been identified.

When comparing the amount of excess reactant used in the reaction to the total amount of excess reactant available, the surplus reactant is then recognized.

If needed, stoichiometry can be used to determine the quantity of extra reactant that is still present.

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Answer:

After determining the amount of moles required for one of the reactants, it was shown that ✔ copper was the limiting reactant and ✔ sulfur was the excess reactant.

Explanation:

edge 2023

In which compound does carbon have an oxidation state of -4?
1.CO
2.CO2
3.CCL4
4.CH4

Answers

Answer:

CH4

Explanation:

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