Calculate the mass of hydrogen gas produced when 12 grams of zinc react with excess sulfuric acid.

Answer: 91

Explanation:

Actual/theoretical X 100  = 42.9/47.2 X 100 = 91

Explanation:

Refer to pic............

Answer:

Therefore, 12 moles of hydrogen makes 8 moles of ammonia

Answer:

F = 30,000 N

Explanation:

Newton's second law

F = m*a

F = 6000 kg * 5.0 m/s^2

F = 30,000 N

At the equivalence point, 0.505 g of phenol reacted with 0.123 M NaOH to form 0.0318 M phenolate ion and 0.0319 M sodium ion, with 0 M hydroxide ion and 0.0318 M H3O+.

The balanced equation for the titration reaction is:

C6H5OH(aq) + OH-(aq) → C6H5O-(aq) + H2O(ℓ)

From the equation, we can see that 1 mole of phenol reacts with 1 mole of hydroxide ion (OH-). To determine the moles of hydroxide ion required to reach the equivalence point, we can use the following equation:

moles of OH- = M × V

where M is the concentration of NaOH, and V is the volume of NaOH required to reach the equivalence point.

To find the volume of NaOH required to reach the equivalence point, we need to calculate the moles of phenol present in the solution. We can use the following equation to do this:

moles of C6H5OH = mass ÷ molar mass

where the molar mass of phenol is 94.11 g/mol.

moles of C6H5OH = 0.505 g ÷ 94.11 g/mol = 0.005368 mol

Since 1 mole of phenol reacts with 1 mole of hydroxide ion, the moles of hydroxide ion required to reach the equivalence point is also 0.005368 mol. Using the equation above, we can calculate the volume of NaOH required:

moles of OH- = M × V

0.005368 mol = 0.123 M × V

V = 0.0437 L = 43.7 mL

Therefore, the volume of NaOH required to reach the equivalence point is 43.7 mL.

At the equivalence point, all of the phenol has reacted with the hydroxide ion, and we have a solution containing only the phenolate ion (C6H5O-) and water. The moles of C6H5O- formed at the equivalence point is equal to the moles of hydroxide ion added:

moles of C6H5O- = moles of OH- added = 0.005368 mol

The volume of the solution at the equivalence point is 125 mL + 43.7 mL = 168.7 mL.

Now, we can use the initial volume and concentration of the phenol solution to calculate the concentration of the phenolate ion and other ions at the equivalence point. The initial concentration of the phenol solution is:

C6H5OH = 0.505 g ÷ (94.11 g/mol × 0.125 L) = 0.424 M

Since the moles of phenol and phenolate ion are equal at the equivalence point, the concentration of the phenolate ion is also 0.005368 mol ÷ 0.1687 L = 0.0318 M.

At the equivalence point, all of the hydroxide ions have reacted with the phenol to form the phenolate ion and water. Therefore, the concentration of hydroxide ion at the equivalence point is 0 M.

The balanced equation also tells us that for every phenolate ion formed, a hydronium ion (H3O+) is also formed. Therefore, the concentration of H3O+ at the equivalence point is equal to the concentration of the phenolate ion:

[H3O+] = 0.0318 M

Finally, to calculate the concentration of sodium ion (Na+) at the equivalence point, we need to consider the balanced equation. For every mole of phenol that reacts, a mole of sodium hydroxide is consumed, forming a mole of sodium phenolate. Therefore, the moles of sodium ion in the solution at the equivalence point is equal to the moles of sodium hydroxide added to reach the equivalence point:

moles of Na+ = moles of NaOH added = 0.123 M × 0.0437 L = 0.00537 mol

The volume of the solution at the equivalence point is 0.1687 L. Therefore, the concentration of sodium ion at the equivalence point is:

[Na+] = 0.00537 mol ÷ 0.1687 L = 0.0319 M

In summary, at the equivalence point of the titration of 0.505 g of phenol with 0.123 M sodium hydroxide solution, the volume of NaOH required is 43.7 mL, and the concentration of the phenolate ion is 0.0318 M, the concentration of hydroxide ion is 0 M, the concentration of H3O+ is 0.0318 M, and the concentration of sodium ion is 0.0319 M.

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Answer:

The percentage of zinc in the compound; Zn3(PO4)2 is 50.65%.

According to the Octet Rule, for a molecule to be stable, all of the atoms must have 8 valence electrons, either by sharing, losing, or acquiring electrons. Atoms typically exchange electrons within covalent bonds in order to adhere to the Octet Rule.

Define covalent bond

The exchange of one or more pairs of electrons between two atoms forms a covalent bond. The two atomic centers are drawing these electrons in unison. When there is insufficient space between two atoms' electronegativities for an electron transfer to take place and create ions, a covalent bond is formed.

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Approximately 225 sec, it will take for 75 percent of the initial amount of C[tex]_{25}[/tex]H[tex]_3[/tex]ON[tex]_3[/tex]⁺(aq) to react. Therefore, the correct option is option B.

The logarithm of a ratio of incident over transmitted radiant power throughout a sample is known as absorbance. As an alternative, absorbance can be characterized simply "the negative logarithm with one less absorptance, as determined on a homogeneous sample," for samples that scatter light.

In several technical fields, the phrase is used to describe how experimental measurement data are quantified. Although the phrase refers to measuring how much light is absorbed, it is frequently confused with measuring how much light is "lost" to either a detector system by other methods. Approximately 225 sec, it will take for 75 percent of the initial amount of C[tex]_{25}[/tex]H[tex]_3[/tex]ON[tex]_3[/tex]⁺(aq) to react.

Therefore, the correct option is option B.

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Your question is incomplete but most probably your full question was,

Approximately how long will it take for 75 percent of the initial amount of C25H30N3. +(aq) to react?

A. 75 sec.

B. 225 sec.

C. 300 sec.

D. 600 sec

Explanation:

Refer to pic..........

Bond A is considered to be a coordinate covalent bond because nitrogen provides a pair of electrons to be shared with hydrogen. That is option C.

A covalent bond is the type of bond that is formed when two different atoms share a pair of electrons in their outermost shell.

A dative or coordinate covalent bond is defined as the type of covalent bond where by the both electrons that are to be shared are supplied by the same atom.

Using ammonium for example, the pair of electrons shared between the ammonia and hydrogen ion is from the Nitrogen of ammonia.

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Answer:

I'd be happy to help with a worksheet on subatomic particles! Here are some potential questions:

1. What are the three subatomic particles found in an atom, and what are their respective charges and locations within the atom?

2. Which subatomic particle determines the identity of an atom?

3. What is the relationship between an element's atomic number and the number of protons in its nucleus?

4. What is an isotope, and how do isotopes of an element differ from each other?

5. What is the difference between an ion and an atom?

6. Describe the process of beta decay and the subatomic particles involved.

7. What is the difference between a molecule and an atom, and how are they related?

8. What is a quark, and what role do they play in subatomic particles?

9. Explain the concept of wave-particle duality and its relevance to subatomic particles.

10. What are the four fundamental forces in the universe, and which subatomic particles are involved in each force?

Explanation:

Answer:

This is confused because they don't have choices

Answer:

1.99875 or 2mols

Explanation:

use the formula moles = mass/molar mass where; the molar mass = mass number of an element

Answer: Who conducted the study?

The study was conducted by the American Heart Association.

What was the topic of the study?

The topic of the study was kids' "screen-time" and its impact on their health.

Where was the study conducted?

The study was conducted in Montreal, Canada.

When was the study conducted?

The specific timeframe of the study is not provided in the question, so it is unclear when the study was conducted.

Why was the study conducted?

The study was conducted to examine the relationship between kids' "screen-time" and their health, specifically looking at the effects on blood vessel health and arterial stiffness. The study aimed to provide more information about the potential negative impacts of excessive screen time on children's health, and to raise awareness about the importance of limiting screen time in order to promote healthier lifestyles for children.

Explanation:

Answer:

The rate of effusion for a gas is inversely proportional to the square-root of its molecular mass (Graham's Law). The gas with the lowest molecular weight will effuse the fastest. The lightest, and therefore fastest, gas is helium.

Explanation:

The mass of aluminum that reacted to produce this quantity of hydrogen gas is 0.181 g.

Partial pressure is a term used in chemistry and physics to describe the pressure that a single gas component would exert if it occupied the same volume as a mixture of gases. In a mixture of gases, each gas exerts a pressure known as its partial pressure, which is proportional to the number of molecules of that gas in the mixture.

To calculate the partial pressure of hydrogen gas in the sample, we can use the following equation:

Partial pressure of hydrogen gas = Total pressure - Vapor pressure of water

Partial pressure of hydrogen gas = 129 kPa - 4.10 kPa = 124.90 kPa

Therefore, the partial pressure of hydrogen gas in the sample is 124.90 kPa.

To calculate the mass of aluminum that reacted to produce this quantity of hydrogen gas, we need to use the balanced chemical equation for the reaction and the ideal gas law. The balanced chemical equation for the reaction of aluminium with hydrochloric acid is as follows:

2Al + 6HCl = 2AlCl3 + 3H2

From the equation, we see that two moles of aluminum react to produce three moles of hydrogen gas. We can use the ideal gas law to calculate the number of moles of hydrogen gas in the sample:

PV = nRT

n = PV/RT

where P is the partial pressure of hydrogen gas, V is the volume of gas collected, R is the gas constant, and T is the temperature in kelvin.

First, we need to convert the temperature from Celsius to kelvin:

T = 29.4 + 273.15 = 302.55 K

Next, we can calculate the number of moles of hydrogen gas:

n = (124.90 kPa)(206.1 mL)/(8.31 L·kPa/mol·K)(302.55 K)

n = 0.0101 moles

Since two moles of aluminum react to produce three moles of hydrogen gas, the number of moles of aluminum that reacted is:

n(Al) = (2/3)n(H2) = (2/3)(0.0101 moles) = 0.00673 moles

Finally, we can use the molar mass of aluminum to calculate the mass of aluminum that reacted:

mass(Al) = n(Al) × molar mass(Al)

mass(Al) = 0.00673 moles × 26.98 g/mol = 0.181 g

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The radius of a tantalum atom if its crystal structure is a BCC with a density of 16. 6 g/cm3 and its atomic mass is 180. 9 amu is 1.456 Å.

The radius of a tantalum atom can be calculated using the formula:

r = (3Vc/4πn)[tex]^\frac{1}{3}[/tex]

where Vc is the unit cell volume, n is the number of atoms in the unit cell, and r is the radius of the atom.

For a BCC structure, there are 2 atoms per unit cell, so n = 2. The unit cell volume for a BCC crystal structure is given as:

Vc = (64/3√3)a³

where a is the length of the edge of the cube.

To solve for the radius of the tantalum atom, we need to first calculate the length of the edge of the cube. We can use the density of tantalum to calculate its atomic mass density:

ρ = m/V

where ρ is the density, m is the mass of the unit cell, and V is the volume of the unit cell. For a BCC unit cell, the mass of the unit cell can be calculated as:

m = n × atomic mass

where n is the number of atoms per unit cell and atomic mass is the atomic mass of the element. Substituting the values given, we get:

ρ = m/V = n × atomic mass / Vc

Rearranging the equation and solving for a, we get:

a = (4ρVc/2n×atomic mass)^⁰⁵

Substituting the given values and solving for a, we get:

a = [(4 × 16.6 g/cm³ × (64/3√3)a³) / (2 × 2 × 180.9 g/mol)][tex]^\frac{1}{2}[/tex]

Simplifying the expression, we get:

a = 3.307 Å

Now, we can calculate the radius of the tantalum atom using the formula:

r = (3Vc/4πn)[tex]^\frac{1}{3}[/tex]

Substituting the values we have calculated, we get:

r = [(3 × (64/3√3)a³) / (4π × 2)][tex]^\frac{1}{3}[/tex] = 1.456 Å

Therefore, the radius of a tantalum atom in a BCC crystal structure with a density of 16.6 g/cm3 and an atomic mass of 180.9 amu is approximately 1.456 Å.

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Wetting agents are added to water to lower its surface tension and increase its ability to penetrate porous materials like fabric, wood, and paper, which are difficult to wet with plain water.

Viscosity is a measure of a fluid's resistance to flow. Wetting agents are added to water to lower its surface tension and increase its ability to penetrate porous materials like fabric, wood, and paper, which are difficult to wet with plain water.

The lower surface tension caused by the wetting agent allows water to spread out more easily, creating a larger surface area to cool and extinguish flames.

The reduction in viscosity also helps the water to penetrate more deeply into the fuel, making it more effective in firefighting.

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From the balanced chemical equation, we can see that 1 mole of P4O10 reacts to form 4 moles of H3PO4. Therefore, we need to find the number of moles of P4O10 to calculate the number of moles of H3PO4.

9 moles of P4O10 reacts with 51 moles of H2O, which means that 9 moles of P4O10 reacts to form 9 moles of H3PO4.

So, the number of moles of H3PO4 formed from 9 moles of P4O10 is 9 mol.

Therefore, the answer is 9 mol.

Answer:

Explanation:

it's 36 my lil sis had the question not long ago so it's 36!! :)

According to the ideal gas equation, the  pressure of 8.88 mole of helium gas at 20.0° C and 180 L volume is 111.97 atmospheres.

Pressure is defined as the force applied on an object perpendicular to it's surface per unit area over which it is distributed.Gauge pressure is a pressure which is related with the ambient pressure.

There are various units by which pressure is expressed most of which are derived units which are obtained from unit of force divided by unit of area . The SI unit of pressure is pascal .

It is a scalar quantity which is related to the vector area element with a normal force acting on it.It is distributed over solid boundaries and across arbitary sections of fluid normal to the boundaries at every point.

According to the ideal gas equation , PV=nRT substitution gives P= 8.88×8.314×273/180=111.97 atmospheres.

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Soil is a mixture of organic and inorganic materials that forms the uppermost layer of the Earth's crust. It is a complex, three-dimensional matrix of mineral particles, organic matter, water, air, and living organisms. Soil provides critical habitat for various microorganisms, insects, plants, and animals, making it a key component of terrestrial ecosystems.

Soil is formed through weathering, which breaks down rocks and other materials into smaller particles. Various factors, including temperature, moisture, wind, and the activities of living organisms, influence this process. Over time, layers of organic matter accumulate on the soil's surface, creating a rich environment for plant growth.

Soil has several important functions, including supporting plant growth, regulating water flow, and cycling nutrients. It also plays a key role in carbon sequestration, helping mitigate climate change's impacts by storing carbon in the form of organic matter.

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48.92 g of CaCO3 decomposes to produce 10.94 L of CO2 at STP.

Carbonic salt of calcium is called Calcium Carbonate.

CaCO3(s) → CaO(s) + CO2(g)

Molar mass of CaCO3 is 100.09 g/mol, so we calculate the number of moles of CaCO3 present as:

48.92 g CaCO3 ÷ 100.09 g/mol = 0.488 mol CaCO3

0.488 mol CO2 are produced

As volume of 1 mole of ideal gas at standard temperature and pressure (STP) is 22.4 L, hence we calculate volume of CO2 produced at STP as:

0.488 mol × 22.4 L/mol = 10.94 L

Therefore, 48.92 g of CaCO3 decomposes to produce 10.94 L of CO2 at STP.

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The properties analyzed in this activity, such as ionic radius, atomic radius, and electronegativity, show periodicity of the chemical elements

It is because they are repeated in a systematic and predictable fashion as you move across a period in the periodic table. Specifically, as you move across a period, the ionic radius increases from left to right. This occurs because the nucleus of elements to the left of the period is larger and has more protons, while the valence electrons increase from left to right, meaning the elements to the right of the period have more electrons that are farther away from the nucleus.

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As per the pictorial representation,the first image is of an element while the second one is that of a mixture of an element and a compound.

It is defined as a substance which cannot be broken down further into any other substance. Each element is made up of its own type of atom. Due to this reason all elements are different from one another.

Elements can be classified as metals and non-metals. Metals are shiny and conduct electricity and are all solids at room temperature except mercury. Non-metals do not conduct electricity and are mostly gases at room temperature except carbon and sulfur.

The number of protons in the nucleus is the defining property of an element and is related to the atomic number.All atoms with same atomic number are atoms of same element.

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The number of moles of NaCl contained in 5 L of a 2.2 M solution is 11 moles

The molarity of a solution gives a relationship between volume and mole of substance. The mathematical relationship is given below:

Molarity = number of mole / Volume

With the above formula, we can determine the number of mole of NaCl in the solution. Details below:

Molarity = number of mole / Volume

Cross multiply

Number of mole = molarity × volume

Number of mole of NaCl = 2.2 × 5

Number of mole of NaCl = 11 moles

Thus, the number of moles of NaCl is 11 moles

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Answer:

1.610 x 10^25 particles

Explanation:

To calculate the number of particles in 26.75 moles of potassium oxide, we can use Avogadro's number, which relates the number of particles in a substance to its number of moles.

Avogadro's number is approximately 6.022 x 10^23 particles per mole. Therefore, we can calculate the number of particles in 26.75 moles of potassium oxide as:

26.75 moles x 6.022 x 10^23 particles/mole = 1.610 x 10^25 particles

Therefore, there are approximately 1.610 x 10^25 particles of potassium oxide in 26.75 moles of the substance.

The adding of additional H2O will result in moving of the equilibrium dynamics to the left, the amounts of CO2 and H2O would increase.

We have equation,

CO₂ + H₂O → H₂CO₃

After adding additional we get,

4CO₂ + 4H₂O → 4H₂CO₃

As equilibrium moves to the left, new reactants are formed by adding extra products to the chemical process. And the equilibrium can be changed by removing a reactant from the system. The chemical equilibrium of the processes is explained by the Le Chatelier's principle. This concept describes how changes in a system's volume, pressure, concentration, and temperature may lead to a new equilibrium state of a process.

The system's equilibrium position lowers the influence of any forced changes in the response state. That example, increasing the temperature will aid in the case of an endothermic process. The presence of a catalyst has no effect on the equilibrium reaction position.

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In magnesium hydroxide, magnesium makes up 41.7% of the compound by mass, and oxygen makes up 55.1% of the compound by mass. The remaining percentage would be hydrogen.

What is Percentage Composition?

Percentage composition refers to the relative mass of each element in a chemical compound expressed as a percentage of the total molecular mass of the compound. In other words, it is the percentage by mass of each element present in a compound.

To determine the percent composition of magnesium hydroxide in a substance, we need to know the mass of magnesium hydroxide in the substance and the total mass of the substance.

Without knowing the substance in question, we cannot determine the mass of magnesium hydroxide. However, we can use the chemical formula of magnesium hydroxide (Mg(OH)2) to calculate the mass percent of magnesium and oxygen in the compound.

The molar mass of magnesium hydroxide is:

24.31 g/mol (for Mg) + 2(15.999 g/mol) (for 2 O) + 2(1.008 g/mol) (for 2 H) = 58.32 g/mol

The mass percent of magnesium in magnesium hydroxide is:

(24.31 g/mol / 58.32 g/mol) x 100% = 41.7%

(2 x 15.999 g/mol / 58.32 g/mol) x 100% = 55.1%

Therefore, in magnesium hydroxide, magnesium makes up 41.7% of the compound by mass, and oxygen makes up 55.1% of the compound by mass. The remaining percentage would be hydrogen.

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The answer to this question depends on the reaction that is taking place.

Reaction is the process of responding to a stimulus. It is an instinctive response to an event, person, object, or situation. It can be conscious or unconscious, rational or irrational. Reactions can be physical (e.g. facial expressions, body language, etc.) or mental (e.g. thoughts, feelings, beliefs, attitudes, etc.). Reactions can vary from person to person, depending on the individual's beliefs and experiences. Reaction is often used to evaluate the success of a stimulus or to measure the intensity of a response.

If the reaction involves the combination of Hg and O2, then the amount of Hg produced will be the same as the amount of O2 produced, which in this case is 310.71 grams. However, if the reaction involves the decomposition of HgO2, then the amount of Hg produced will be twice the amount of O2 produced, which in this case would be.621.42 grams.

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Answer:

219600 Pa (or 2.196 bar, or 31.9 psi).

Explanation:

weight of water:

volume of water = 2m x 5m x 8m = 80 cubic meters

weight of water = volume of water x density of water x gravitational acceleration

density of water is 1000 kg/m^3 and the gravitational acceleration is 9.81 m/s^2.

weight of water = 80 x 1000 x 9.81 = 784800 N

weight of the tank

volume of tank = 2m x 5m x 8m = 80 cubic meters

weight of tank = volume of tank x density of tank x gravitational acceleration

relative density of the tank material is 1.8, which means its density is 1.8 times that of water, or 1800 kg/m^3.

weight of tank = 80 x 1800 x 9.81 = 1411200 N

The total weight acting on the bottom of the tank is the sum of the weight of the water and the weight of the tank:

Total weight = weight of water + weight of tank = 2196000 N

The max pressure at the bottom of the tank is the total weight divided by the area of the bottom of the tank:

max pressure = total weight / area of bottom of tank

the area of the bottom of the tank is 2m x 5m = 10 square meters.

Max pressure = 2196000 N / 10 m^2 = 219600 Pa

Therefore, your answer is 219600 Pa (or 2.196 bar, or 31.9 psi)

Hope this helped. Let me know if you need any further explanation.