Question 12
Section 6-9
The theoretical yield of product for a particular reaction is 65.45 g. A very careless student obtained only 21.47 g of product after carrying out this reaction.

What is the percent yield that this student obtained?

• Enter a number only; do not spell
• Include the correct number of significant figures for your answer

Answer: % yield

An ionic equation for sodium hydroxide and calcium carbonate is Na⁺ + OH⁻ + Ca²⁺ + CO₃²⁻[tex]\rightarrow[/tex]Na⁺ +CO₃²⁻ + Ca²⁺ + OH⁻.

Ionic equation is defined as a chemical equation which represents electrolytes in aqueous solutions and are expressed as dissociated ions. Ions present in aqueous solutions are stabilized by ion dipole interactions with the water molecules which are present.

An ionic equation can be written for any electrolyte which dissociates and reacts with the polar solvent. In a balanced ionic equation , number and type of atoms on each sides of reaction arrow are same. Even the net charge on both sides of the arrow is same.

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Answer:

Explanation:

For NaOH:

Molarity = moles of solute / liters of solution

Molality = moles of solute / mass of solvent (in kg)

Normality = equivalents of solute / liters of solution

First, we need to find the moles of NaOH:

moles of NaOH = mass of NaOH / molar mass of NaOH

moles of NaOH = 20 g / 40 g/mol

moles of NaOH = 0.5 mol

Next, we need to find the liters of solution:

liters of solution = 600 mL / 1000 mL/L

liters of solution = 0.6 L

Now we can calculate the molarity:

Molarity = 0.5 mol / 0.6 L

Molarity = 0.833 M

To find the molality, we need to find the mass of the solvent (water) in kg:

mass of solvent = volume of solution x density of solvent

mass of solvent = 0.6 L x 1.10 g/mL

mass of solvent = 0.66 kg

Now we can calculate the molality:

Molality = 0.5 mol / 0.66 kg

Molality = 0.758 mol/kg

Finally, to find the normality, we need to know that NaOH is a monoprotic base (i.e. donates one H+ ion per molecule). Therefore, the equivalents of NaOH is equal to the moles of NaOH:

Normality = 0.5 eq / 0.6 L

Normality = 0.833 eq/L

For Ba(OH)2:

Molarity = moles of solute / liters of solution

Molality = moles of solute / mass of solvent (in kg)

Normality = equivalents of solute / liters of solution

First, we need to find the moles of Ba(OH)2:

moles of Ba(OH)2 = mass of Ba(OH)2 / molar mass of Ba(OH)2

moles of Ba(OH)2 = 50 g / (137.33 g/mol x 2)

moles of Ba(OH)2 = 0.182 mol

Next, we need to find the liters of solution:

liters of solution = 800 mL / 1000 mL/L

liters of solution = 0.8 L

Now we can calculate the molarity:

Molarity = 0.182 mol / 0.8 L

Molarity = 0.227 M

To find the molality, we need to find the mass of the solvent (water) in kg:

mass of solvent = volume of solution x density of solvent

mass of solvent = 0.8 L x 1.15 g/mL

mass of solvent = 0.92 kg

Now we can calculate the molality:

Molality = 0.182 mol / 0.92 kg

Molality = 0.198 mol/kg

Finally, to find the normality, we need to know that Ba(OH)2 is a diprotic base (i.e. donates two H+ ions per molecule). Therefore, the equivalents of Ba(OH)2 is twice the moles of Ba(OH)2:

Normality = 0.364 eq / 0.8 L

Normality = 0.455 eq/L

Molarity of H3PO4:

First, calculate the number of moles of H3PO4:

m(H3PO4) = 40 g

Molecular weight of H3PO4 = 3(1.01) + 1.01 + 4(16) = 98 g/mol

n(H3PO4) = m(H3PO4) / M(H3PO4) = 40 g / 98 g/mol = 0.4082 mol

Now, calculate the volume of the solution in liters:

V = 900 mL = 0.9 L

Molarity (M) = n / V = 0.4082 mol / 0.9 L = 0.4536 M

Molality of H3PO4:

Mass of solvent (water) = (900 mL) x (1.30 g/mL) - 40 g = 1040 g

Molality (m) = n(H3PO4) / m(solvent) = 0.4082 mol / 1.040 kg = 0.3929 m

Normality of H3PO4:

H3PO4 is a triprotic acid, meaning that it can donate up to three protons (H+ ions) per molecule. The normality of H3PO4 depends on which proton(s) we are interested in. Here, we will calculate the normality with respect to the first proton.

One mole of H3PO4 can donate three moles of H+ ions, so the equivalent weight (the weight that can donate one mole of H+ ions) of H3PO4 is its molecular weight divided by three:

Equiv. Wt. = 98 g/mol / 3 = 32.67 g/mol

Normality (N) = Molarity x Number of H+ ions donated per molecule / Equivalent weight

For the first proton, the number of H+ ions donated per molecule is 1. Therefore:

N = 0.4536 M x 1 / 32.67 g/mol = 0.01388 N

First, we need to calculate the number of moles of Na2CO3:

Molar mass of Na2CO3 = 2(23) + 12 + 3(16) = 106 g/mol

Number of moles of Na2CO3 = mass/molar mass = 25 g / 106 g/mol = 0.235 moles

Next, we can calculate the molarity, molality and normality using the following formulas:

Molarity = moles of solute / liters of solution

Molarity = 0.235 moles / 1 L = 0.235 M

Molality = moles of solute / mass of solvent (in kg)

Density of solution = 1.05 g/mL = 1050 kg/m³

Volume of solution = 1000 mL = 1 L

Mass of solvent = volume of solution x density of solution = 1 L x 1050 kg/m³ = 1050 g = 1.05 kg

Molality = 0.235 moles / 1.05 kg = 0.224 mol/kg

Normality = (moles of solute x equivalent weight) / liters of solution

The equivalent weight of Na2CO3 is equal to its molar mass divided by the number of hydrogen ions it can donate in a reaction, which is 2.

Equivalent weight of Na2CO3 = molar mass / 2 = 106 g/mol / 2 = 53 g/eq

Normality = (0.235 moles x 53 g/eq) / 1 L = 12.455 N

According to the question 88.4 grams of carbon dioxide must form.

Carbon dioxide is a colorless, odorless, non-toxic gas composed of two oxygen atoms and one carbon atom. It is a natural component of Earth's atmosphere and is produced through natural processes such as respiration and combustion. It is also produced artificially through processes such as burning fossil fuels and manufacturing. Carbon dioxide plays an important role in regulating the Earth's climate.

The reaction equation for the formation of carbon dioxide is:

C (graphite) + O2 → CO2

To find the amount of carbon dioxide that must form, we must multiply the number of moles of carbon (graphite) by the molar mass of carbon dioxide (44.01 g/mol).

25.0 g C × (1 mol C / 12.01 g C) × (44.01 g CO2 / 1 mol CO2) = 88.4 g CO2

Therefore, 88.4 grams of carbon dioxide must form.

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The final temperature of the water is 100°C - 63.4°C = 36.6°C. Temperature can affect the physical and chemical properties of substances, including their volume, pressure, and reactivity.

What is Temperature?

Temperature is a measure of the average kinetic energy of the particles in a substance. In other words, it is a measure of how hot or cold a substance is. Temperature is usually measured in units of degrees Celsius (°C) or degrees Fahrenheit (°F), or Kelvin (K) in the scientific context. The Celsius and Fahrenheit scales are based on the freezing and boiling points of water, while the Kelvin scale is based on the absolute zero point where all molecular motion ceases.

q = m·C·ΔT

where q is the heat transferred, m is the mass of the substance, C is the specific heat capacity, and ΔT is the change in temperature.

First, we need to determine the initial temperature of the water. We know that the water vapor is at 100°C, which is also the boiling point of water at standard pressure. Therefore, we can assume that the water vapor is in equilibrium with liquid water at 100°C. The heat required to convert 55.0 g of water at 100°C into water vapor at 100°C can be calculated as follows:

q1 = m·ΔHv

q1 = 55.0 g · 2257 J/g = 124,135 J

This means that 124,135 J of heat were absorbed by the water to vaporize it at 100°C.

Next, we need to determine the amount of heat that is removed from the water vapor. We know that 144 kJ of energy were removed from the water vapor. This can be converted to joules as follows:

q2 = 144 kJ · 1000 J/kJ = 144,000 J

Now, we can use the equation to find the final temperature of the water:

q1 + q2 = m·C·ΔT

where ΔT is the change in temperature, which is what we want to find.

First, we need to determine the total mass of the water vapor and liquid water:

m = 55.0 g + 124,135 J / 2257 J/g = 108.3 g

Next, we need to determine the specific heat capacity of water at constant pressure. This is approximately 4.18 J/g·°C.

Now we can substitute these values into the equation and solve for ΔT:

144,135 J + 144,000 J = 108.3 g · 4.18 J/g·°C · ΔT

ΔT = (144,135 J + 144,000 J) / (108.3 g · 4.18 J/g·°C) = 63.4°C

Therefore, the final temperature of the water is 100°C - 63.4°C = 36.6°C.

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Answer:

When salt is mixed with water, the salt dissolves because the covalent bonds of water are stronger than the ionic bonds in the salt molecules.

Explanation:

its like cotton candy in water

AWater can dissolve salt because the positive part of water molecules attracts the negative chloride ions and the negative part of water molecules attracts the positive sodium ions. The amount of a substance that can dissolve in a liquid (at a particular temperature) is called the solubility of the substance

Explanation:

A chemical reaction is started by adding the borax solution to the glue mixture. A elastic, springy new material is produced when the glue and borax molecules interact.

Although cleaning is borax's most well-known application, the substance is also included in a wide range of home goods, such as specialty toothpastes and mouthwashes. goods for treating acne, including lotions, skin creams, moisturizers, and sunscreen. Ceramic glaze and paint.

Borax (sodium tetraborate) is different from baking soda (sodium bicarbonate). Both salts and widely used as "green" home cleaners, baking soda and borax have pH values of 8 and 9.5, respectively.

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Answer: dont get it

Explanation:

The following chemical equation can represent the reaction:

Mg (s) + FeSO4 (aq) → MgSO4 (aq) + Fe (s)

In this reaction, the magnesium metal (Mg) replaces the iron (Fe) in the iron (II) sulfate (FeSO4) solution to form magnesium sulfate (MgSO4) and elemental iron (Fe). This is an example of a single displacement or substitution reaction, where one element replaces another element in a compound.

A catalyst is a substance that increases the rate of a chemical reaction by lowering the activation energy required for the reaction to occur. Catalysts provide an alternative pathway for the reaction that requires less energy to reach the desired products.

Examples of catalysts include enzymes, which are biological catalysts involved in many biochemical reactions in living organisms, and transition metal complexes, commonly used in industrial chemical reactions.

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The balanced chemical equation for the reaction is: Fe(s) + 2CuCl2(aq) → 2FeCl3(aq) + Cu(s)

The equation shows that one mole of solid iron reacts with two moles of aqueous copper(II) chloride to produce two moles of aqueous iron(III) chloride and one mole of solid copper.

To balance the equation, we need to ensure that the number of atoms of each element is the same on both sides of the equation. Here's how we balance the equation:

Fe(s) + 2CuCl2(aq) → 2FeCl3(aq) + Cu(s)

On the left-hand side, we have one iron atom (Fe) and two copper atoms (Cu). On the right-hand side, we have two iron atoms (Fe) and one copper atom (Cu). To balance the iron atoms, we add a coefficient of 2 in front of Fe(s) on the left-hand side:

2Fe(s) + 2CuCl2(aq) → 2FeCl3(aq) + Cu(s)

Now we have two iron atoms on both sides. However, we also have four chloride ions (Cl-) on the left-hand side and six chloride ions on the right-hand side. To balance the chloride ions, we add a coefficient of 3 in front of CuCl2(aq) on the left-hand side:

2Fe(s) + 3CuCl2(aq) → 2FeCl3(aq) + Cu(s)

Now we have two iron atoms, six chloride ions, two copper ions (Cu2+), and one copper atom on both sides. The equation is balanced!

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Mechanical energy spins a turbine, a turbine spins a magnet creating disturbances in a magnetic field, a magnetic field moves electrons in a conductor, electron creates a current of electricity are the steps to making electricity with a generator.

What is electric field ?

According to mathematics, the electric field is described as a vector field that may be connected to each point in space and represents the force per unit charge that is applied to a positive test charge that is at rest at that location. Either the electric charge or time-varying magnetic fields can produce an electric field.

What is energy?

The capacity to work comes from energy. Energy types include chemical, nuclear, and electrical energy. Science and engineering both depend on the idea of energy. Here is a look at the classification of energy as well as its description and examples.

Therefore, Mechanical energy spins a turbine, a turbine spins a magnet creating disturbances in a magnetic field, a magnetic field moves electrons in a conductor, electron creates a current of electricity re the steps to making electricity with a generator.

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Answer:

The correct order of the steps to making electricity with a generator is:

First, mechanical energy is used to spin a turbine, which is typically connected to a magnet. As the turbine spins the magnet, it creates disturbances in a magnetic field. These disturbances then cause the magnetic field to move electrons in a nearby conductor, such as a wire. This movement of electrons creates a flow of electrical current through the wire, which can be used to power various devices. Therefore, the final step is the production of electricity, as electrons flow through the conductor and create a current of electricity.

Answer:

At the top of a seamount, the temperature is generally cooler and the pressure is lower compared to the bottom of a trench. This is because the its closer to the ocean surface, where sunlight and atmospheric conditions can affect the temperature and pressure.

The bottom of a trench is located at a much greater depth and is subject to extreme pressure and temperatures. The temperature at the bottom of a trench can be very high due to the heat generated by tectonic activity and volcanic processes.

Explanation:

The reaction is classified as a double displacement or metathesis reaction.

A double displacement reaction is a type of chemical reaction in which two reactants exchange ions or compounds to form new products.

During this reaction, the positive and negative ions of two compounds switch places, resulting in the formation of two new compounds. A common example of a double displacement reaction is the reaction between silver nitrate and sodium chloride, which forms silver chloride and sodium nitrate.

Double displacement reactions are also known as metathesis reactions or exchange reactions.

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Thus, the mass of  carbon dioxide created is 66.02 g, while the volume of water produced was 27.03 g.

Many health impacts from CO2 exposure may occur. These symptoms could include a coma, hypoxia, convulsions, sweating, disorientation, restlessness, a tingling and pins-and-needles sensation, difficulty breathing, fatigue, increased heart rate, and high blood pressure.

Through inhalation, CO2 is regarded as having low toxicity. CO2 behaves like a basic asphyxiant, which is what causes the majority of its negative health impacts. A gas known as a simple asphyxiant lowers or replaces the typical oxygen in breathing air. Headache and sleepiness are two signs of modest CO2 exposure.

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The rate of diffusion of two gases is 7 cm³/sec and 35 cm³/sec respectively.

The rate of diffusion is the amount of gas passing through the an area in unit time.

The diffusion rate depends on several factors:

Given,

Volume of first gas = 280 cm³

Time of first gas = 40 seconds

Volume of second gas = 350 cm³

Rime of second gas = 10 seconds

Rate of diffusion = volume of gas diffused ÷ time

Rate for first gas = 280 ÷ 40

                            = 7 cm³/sec

Rate of second gas = 350 ÷ 10

                                 =  35 cm³/sec

Therefore, The rate of diffusion of two gases is 7 cm³/sec and 35 cm³/sec respectively.

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The final temperature of the water and zinc mixture is 22.8◦C.

The principle of conservation of energy is a fundamental law of physics that states that the total energy of an isolated system remains constant over time. This means that energy cannot be created or destroyed; rather, it can only be transformed from one form to another. In other words, the total amount of energy in a system remains constant, even though it may change form or be transferred from one object to another.

This principle is a consequence of the laws of physics, and it applies to all natural processes. It is a fundamental principle of thermodynamics, which is the branch of physics that deals with the relationship between heat, energy, and work. According to this principle, energy can be converted from one form to another, such as from thermal energy to kinetic energy, but the total amount of energy in the system remains constant.

To solve this problem, we can use the principle of conservation of energy, which states that the total energy in a closed system remains constant. The energy gained by one object must be equal to the energy lost by the other object.

Let T be the final temperature of the water and zinc mixture. Then, the energy gained by the zinc is:

Q1 = mcΔT1

where m is the mass of the zinc, c is its specific heat capacity, and ΔT1 is the change in temperature of the zinc, given by:

ΔT1 = T - 66

The energy lost by the water is:

Q2 = mcΔT2

where m is the mass of the water, c is its specific heat capacity, and ΔT2 is the change in temperature of the water, given by:

ΔT2 = T - 17

According to the principle of conservation of energy, Q1 = Q2. Therefore, we have:

mcΔT1 = mcΔT2

Simplifying and solving for T, we get:

T = (mcΔT2 + 66cΔT1)/(mc)

Plugging in the given values, we get:

T = (39 kg x 4180 J/kg·◦C x (T - 17◦C) + 15 kg x 388 J/kg·◦C x (T - 66◦C))/(39 kg x 4180 J/kg·◦C + 15 kg x 388 J/kg·◦C)

Simplifying and solving for T, we get:

T = 22.8◦C

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The height of the parallelogram-shaped pattern block is 25 mm.

The formula to find the area (A) of a parallelogram is A = base x height.

In the given parallelogram-shaped pattern block, we are given the area A = 525 mm² and the base b = 21 mm (assuming the base is the bottom side of the parallelogram).

Using the formula, we can rearrange it to solve for the height h:

A = base x height

=> h = A / base

Substituting the given values, we get:

h = 525 mm² / 21 mm

h = 25 mm

Therefore, the height of the parallelogram-shaped pattern block is 25 mm using A = base x height.

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The height of the parallelogram-shaped pattern block can be calculated using the formula:

Area of parallelogram = base x height

We know that the area of the parallelogram is A=525 mm² and the base is 21 mm. We can rearrange the formula and solve for the height:

height = A / base

height = 525 mm² / 21 mm

height ≈ 25 mm

Therefore, the height of the parallelogram-shaped pattern block is approximately 25 mm.

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Answer:

The first step is to convert the given mass of HCl to moles:

moles of HCl = mass of HCl / molar mass of HCl

moles of HCl = 7.68 g / 36.46 g/mol

moles of HCl = 0.2103 mol

Next, we need to convert the given volume of solution to liters:

volume of solution = 253 mL = 0.253 L

Now we can calculate the molarity of the solution:

molarity = moles of solute / volume of solution

molarity = 0.2103 mol / 0.253 L

molarity = 0.831 M

Therefore, the molarity of the HCl solution is 0.831 M.

Explanation:

The exponent to the power of 0 would be the correct answer in this situation.

Initial rate is the rate of reaction at the beginning of a chemical reaction. It is usually measured at the start of the reaction and is usually higher than the rate at equilibrium. The initial rate is an important factor in determining the rate of reaction and the products of the reaction. It can be used to determine the effects of various factors such as temperature, pressure, and concentration on the reaction rate.

Exponents represent the number of times the base number is multiplied by itself. So, if the rate does not double nor stay the same, then it is not being multiplied by itself, so the exponent would be to the power of 0.

Exponentiation can be used to show how many times a number is multiplied by itself, and this is done by raising the base number to a certain power. For example, 4 to the power of 3 means 4 x 4 x 4 = 64. In this case, the exponent is 3.

If the initial rate does not double nor stay the same, then the power associated with the exponent would be 0. This is because the rate is not being multiplied by itself, so it would not be associated with any power. Therefore, the exponent would be to the power of 0.

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5. 4.00 moles of O2 can react to produce 4.00 moles of CO2.

What is the relationship between moles of O2 and moles of CO2?

According to the balanced chemical equation, the ratio of moles of O2 to moles of CO2 is 2:1, which means that 4 moles of O2 would react with 2 moles of CH4 to produce 2 moles of CO2. Therefore, statement 5 is true.

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Answer:

Below

Explanation:

For Carbon:

40.002 % * 180.156   = 72.066 gm/mole C     per mole of fructose

For Hydrogen:

6.714 %  * 180.156     = 12.096  gm H

For Oxygen:

53.285% *  180.156  = 95.966 gm of O

Now use periodic table to find mole wts of each

   72.066 / 12.011   = 6    moles of C per mole of fructose   ( wt = 12.011)

   12.096/ 1.008    =  12   moles of  H                                     (wt = 1.008)

    95.966/15.999 = 6     moles of O                                      (wt = 15.999)

C6 H12 O6     is MOLECULAR formula     divide everything by 6

C H2 O     is EMPIRICAL

The theoretical yield of AlCl₃ is 28.65g and percentage yield is 33.15%.

What is yield of a reaction?

In chemistry, yield, also referred to as reaction yield, is a measure of the quantity of moles of a product formed in relation to the reactant consumed, obtained in a chemical reaction, usually expressed as a percentage.

Theoretical yield of a reaction is calculated assuming that there is no error in the reaction procedure. Percentage yield can be calculated by the formula-

%Yield =  (Actual yield ÷ theoretical yield) ×100

Given,

Mass of Al(OH)₃ = 50.3g

According to reaction given,

78g Al(OH)₃ gives - 44.44g AlCl₃

1g Al(OH)₃ gives - 0.56g AlCl₃

Then, 50.3g Al(OH)₃ gives - 0.56×50.3 = 28.65g AlCl₃

%Yield = (9.5÷28.65) × 100

Therefore, the theoretical yield of AlCl₃ is 28.65g and percentage yield is 33.15%.

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The percent yield for this reaction of oxygen with Iron, would be 73. 2 %.

The percentage yield in a reaction can be found by the formula :

= Actual yield / Theoretical yield x 100 %

Theoretical yield of iron (III) oxide = 12.3 g

Actual yield of iron (III) oxide = 9.00 g

The percentage yield is therefore ;

= 9. 00 / 12. 3 x 100 %

= 0.732 x 100 %

= 73. 2 %

In conclusion, the percent yield is 73. 2 %.

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Answer:

Static Electricity

Explanation:

The shock that you feel when your body fills with extra electrons and you touch a good conductor is an example of static electricity, not an electrical current.

Static electricity is an imbalance of electric charges within or on the surface of a material. When two objects with different electric charges come into contact, such as your body and a good conductor, electrons can transfer from one object to another, resulting in a buildup of static electricity. When the electrical potential difference between the two objects becomes high enough, the electrons can jump across the gap in the form of a spark, creating a sudden discharge of static electricity, or shock.

In contrast, an electrical current is a continuous flow of electric charge through a conductor, such as a wire. Electrical currents are typically created by the movement of electrons or ions, and they are the basis for most forms of electrical energy and power.

So, the shock that you feel when your body fills with extra electrons and you touch a good conductor is an example of static electricity because it involves a buildup of electric charge that is released suddenly in the form of a spark or shock.

Therefore, the volume of the balloon will be 8.7 L when taken outside at a temperature of 2 degrees Celsius.

Volume is a measure of the amount of space occupied by a three-dimensional object or substance. It is usually measured in cubic units, such as liters, cubic meters, or cubic feet. Volume can be calculated by multiplying the length, width, and height of an object (in the case of regular-shaped objects), or by using mathematical formulas or measurements of displacement (in the case of irregular-shaped objects or substances). Volume is an important concept in physics, chemistry, and engineering, as it is used to describe the behavior of gases, liquids, and solids, as well as the properties of various materials and substances.

Here,

To solve this problem, we can use the ideal gas law, which states that PV = nRT, where P is the pressure of the gas, V is its volume, n is the number of moles of gas, R is the gas constant, and T is the temperature of the gas in Kelvin.

To find the final volume of the balloon, we need to assume that the pressure and the number of moles of gas remain constant. Therefore, we can write:

P1V1/T1 = P2V2/T2

where P1 is the pressure at the initial temperature, T1 is the initial temperature in Kelvin, P2 is the pressure at the outdoor temperature, which we assume is the same as the initial pressure, and T2 is the outdoor temperature in Kelvin.

To convert Celsius to Kelvin, we add 273.15 to the Celsius temperature. Therefore, T1 = 24 + 273.15 = 297.15 K and T2 = 2 + 273.15 = 275.15 K.

Substituting the values into the equation, we get:

V2 = (P1/T1) x T2 x V1/P2

= (1 atm / 297.15 K) x 275.15 K x 9.2 L / (1 atm)

= 8.7 L (rounded to the nearest tenth)

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If 25.82 mL of 0.0500 M NaOH solution are required to reach the equivalence point of an acid-base titration of 40.0 mL of 7-Up, the number of NaOH required is 0.00126 moles.

The point at which chemically identical amounts of reactants are put together is known as the equivalence point in a chemical reaction.

In other words, during titration, it is the point at which the titrant addition is sufficient to totally neutralize the analyte solution. The number of moles of a solution with an unknown concentration is equal to the number of moles of a titrant, or standard solution. Because it is a point where the amount of acid and base required to neutralize a solution is equal, it is often referred to as the stoichiometric point. It should be noted that the acid to base ratio need not be 1:1. The balanced acid-base chemical equation explains this acid-base ratio. For this, indicators might be used, for example, phenolphthalein or methyl orange.

The reaction between citric acid and NaOH is,

H₃C₆H₅O₇(aq) + 3NaOH(aq) →   Na₃C₆H₅O₇(aq) + 3H₂O(l)

According to the formula,

M = [tex]\frac{n}{V}[/tex]

where,

M is the molarity,

n is the number of moles and,

V is the volume(L)

For NaOH;

M = 0.0500 M

V = 25.82ml = 0.02582 l

n = M × V

n = 0.00126 moles

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Answer:

3,272,000

Explanation:

Find the number of molecules in 3.72 mol of sulfur dioxide: There are 78.54 g of nitrogen dioxide in 3.72 mol of sulfur dioxide, so there are 3,272,000 molecules in 3.72 mol of sulfur dioxide.

Explanation:

We need to use the first law of thermodynamics, which states that the change in internal energy (ΔU) of a system is equal to the heat (q) added to the system minus the work (w) done by the system:

ΔU = q - w

First, we need to convert the units of work from kcal to kJ:

375 kcal × 4.184 J/kcal = 1570.5 J = 1.5705 kJ

Now we can plug in the values we have:

ΔU = (5.00×10² kJ) - (1.5705 kJ)

ΔU = 498.4295 kJ

Therefore, the change in internal energy of the system is ΔU = 498.4295 kJ.

Answer: Both are Chemical changes.

Explanation: When you bake a cookie, you start out with a mixture of ingredients. These can include substances such as Baking Soda. When high heat is applied to Baking Soda, it starts to break down into Carbon Dioxide. This is an example of a chemical change because a new substance is formed. Proteins also break down at high heat in an oven resulting in a chemical change.

For the second change, a chemical reaction might help you visualize what's going on. 3 Ag2S(s) + 2 Al(s) ---> 6 Ag(s) + Al2S3(s) is the reaction that's occuring. We can clearly see that the products are different substances than the reactants indicating a chemical change.

To review, chemical changes are changes that result in the alteration of the structure of a substance which leads to the production of a new substance.

Hope this helps!

Thus, in order to make 0.075 mol of water, 0.0375 moles or ammonium perchlorate are required.

Perchlorate can be purchased by any qualified specialists who plan to utilize the substance legally. Since this molecule and all of its derivatives are compounds requiring extremely professional expertise in handling, the procurement and handling of item must be subject to a number of laws.

An odorless, white, dust powder known as ammonium perchlorate. As an etching and etching agent, it is employed in analytical chemistry. Moreover, it is utilized in explosives and for animal fattening. According to DOT and NFPA citations, ammonium perchlorate is listed as a hazardous substance.

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