Question 1

How many C atoms are in 5.50 g of C?

Accepted Answer

A) 5.01 x 1022 C atoms 
B) 3.31 x 1024 C atoms 
C) 6.02 x 1023 C atoms 
D) 2.76 x 1023 C atoms 
E) 5.50 x 1023 C atoms 
A) 5.01 x 1022 C atoms 
B) 3.31 x 1024 C atoms 
C) 6.02 x 1023 C atoms 
D) 2.76 x 1023 C atoms 
E) 5.50 x 1023 C atoms

Question 2

What is the average mass, in grams, of one Rb atom?

Accepted Answer

A) 6.02 x 1023 g 
B) 1.42 x 10-22g 
C) 5.15 x 1025 g 
D) 85.47 g 
E) 85.47 amu 
A) 6.02 x 1023 g 
B) 1.42 x 10-22g 
C) 5.15 x 1025 g 
D) 85.47 g 
E) 85.47 amu

Question 3

Ammonia reacts with hydrochloric acid to produce ammonium chloride.Identify the balanced reaction that describes this process.

Accepted Answer

A) NH4+ + HCl $\rarr$ NH4Cl + H 
B) NH3 + HCl $\rarr$ NH4Cl 
C) NH3 + 2HCl $\rarr$ NH4Cl + H 
D) NH4+ + 2HCl $\rarr$NH4Cl2 
E) NH3 + 2HCl $\rarr$ NH4Cl2 
A) NH4+ + HCl $\rarr$ NH4Cl + H 
B) NH3 + HCl $\rarr$ NH4Cl 
C) NH3 + 2HCl $\rarr$ NH4Cl + H 
D) NH4+ + 2HCl $\rarr$NH4Cl2 
E) NH3 + 2HCl $\rarr$ NH4Cl2

Question 4

What is the mass of 3.50 x 1024 Ti atoms?

Accepted Answer

A) 47.9 amu 
B) 47.9 g 
C) 5.81 g 
D) 278 g 
E) 5.81 amu 
A) 47.9 amu 
B) 47.9 g 
C) 5.81 g 
D) 278 g 
E) 5.81 amu

Question 5

When a 0.860 g sample of an organic compound containing C, H, and O was burned completely in oxygen, 1.64 g of CO2 and 1.01 g of H2O were produced.What is the empirical formula of the compound?

Accepted Answer

Question 6

Calculate the molar mass, in g/mol, of Al2(SO4)3.

Accepted Answer

Question 7

When octane (C8H18)is burned in a particular internal combustion engine, the yield of products (carbon dioxide and water)is 93%.What mass of carbon dioxide will be produced in this engine when 15.0 g of octane is burned with 15.0 g of oxygen gas?

Accepted Answer

A) 12.g 
B) 13.g 
C) 21 g 
D) 43.g 
E) 54.g 
A) 12.g 
B) 13.g 
C) 21 g 
D) 43.g 
E) 54.g

Question 8

Calculate the mass of N in 2.34 g of N2H4?

Accepted Answer

A) 4.68 g N 
B) 65.6 g N 
C) 28.02 g N 
D) 2.05 g N 
E) 2.34 g N 
A) 4.68 g N 
B) 65.6 g N 
C) 28.02 g N 
D) 2.05 g N 
E) 2.34 g N

Question 9

Ammonia reacts with oxygen to form nitric oxide and water vapor: 
4NH3 + 5O2 $\rarr$ 4NO + 6H2O
When 20.0 g NH3 and 50.0 g O2 are allowed to react, which is the limiting reagent?

Accepted Answer

A) NH3 
B) O2 
C) NO 
D) H2O 
E) No reagent is limiting. 
A) NH3 
B) O2 
C) NO 
D) H2O 
E) No reagent is limiting.

Question 10

Balance the following and list the coefficients in order from left to right. ___ Cr + ___ H2SO4 $\rarr$ ___ Cr2(SO4)3 + ___ H2

Accepted Answer

A) 2, 3, 1, 2 
B) 2, 3, 1, 3 
C) 1, 3, 1, 3 
D) 4, 6, 2, 6 
E) 1, 3, 1, 2 
A) 2, 3, 1, 2 
B) 2, 3, 1, 3 
C) 1, 3, 1, 3 
D) 4, 6, 2, 6 
E) 1, 3, 1, 2

Question 11

Hydrogen gas is reacted with nitrogen gas to form ammonia gas.Write the balanced reaction (omit state symbols (s), (l), (g), (aq), etc.).

Accepted Answer

The answer of Hydrogen gas is reacted with nitrogen gas...

Question 12

The empirical formula of a compound of uranium and fluorine that is composed of 67.6% uranium and 32.4% fluorine is

Accepted Answer

A) U2F 
B) U3F4 
C) UF4 
D) UF6 
E) UF8 
A) U2F 
B) U3F4 
C) UF4 
D) UF6 
E) UF8

Question 13

How many moles of C are in 1.22 moles of C6H12O6?

Accepted Answer

A) 7.32 moles C 
B) 87.9 moles C 
C) 1.22 moles C 
D) 14.7 moles C 
E) 2.44 moles C 
A) 7.32 moles C 
B) 87.9 moles C 
C) 1.22 moles C 
D) 14.7 moles C 
E) 2.44 moles C

Question 14

In the Haber process, hydrogen gas reacts with nitrogen gas to produce ammonia.How many kilograms of hydrogen would be required to react completely with 1.0 kg of nitrogen, and how many kilograms of ammonia would be formed?

Accepted Answer

0.22 kg hydrogen req

Question 15

What is the theoretical yield of PI3 from the reaction of 27.0 g of P and 68.0 g of I2?
2P(s)+ 3I2(s)$\rarr$2PI3(s)

Accepted Answer

Question 16

Ammonia is reacted with sulfuric acid to form ammonium sulfate.Write the balanced reaction (omit state symbols (s), (l), (g), (aq), etc.).

Accepted Answer

The answer of Ammonia is reacted with sulfuric acid to...

Question 17

What is the limiting reagent when 27.0 g of P and 68.0 g of I2 react according to the following chemical equation?
2P(s)+ 3I2(s)$\rarr$2PI3(s)

Accepted Answer

Question 18

Calculate the molecular mass of menthol, C10H20O.

Accepted Answer

A) 156.26 amu 
B) 140.26 amu 
C) 29.02 amu 
D) 48.17 amu 
E) 137.11 amu 
A) 156.26 amu 
B) 140.26 amu 
C) 29.02 amu 
D) 48.17 amu 
E) 137.11 amu

Question 19

Zircon is a mineral with the empirical formula ZrSiO4.If all the zirconium is 90Zr, all the silicon is 28Si, and all the oxygen is 16O, what mass of oxygen is present in 10.g of zircon?

Accepted Answer

A) 0.88 g 
B) 1.2 g 
C) 1.8 g 
D) 3.5 g 
E) 5.4 g 
A) 0.88 g 
B) 1.2 g 
C) 1.8 g 
D) 3.5 g 
E) 5.4 g

Question 20

What is the minimum mass of oxygen gas necessary to produce 200.g of sulfuric acid in the following reaction?
2SO2 + O2 + 2 H2O $\rarr$2H2SO4

Accepted Answer

Exam 3: Mass Relationships in Chemical Reactions

How many C atoms are in 5.50 g of C?

What is the average mass, in grams, of one Rb atom?

Ammonia reacts with hydrochloric acid to produce ammonium chloride.Identify the balanced reaction that describes this process.

What is the mass of 3.50 x 1024 Ti atoms?

When a 0.860 g sample of an organic compound containing C, H, and O was burned completely in oxygen, 1.64 g of CO2 and 1.01 g of H2O were produced.What is the empirical formula of the compound?

Calculate the molar mass, in g/mol, of Al2(SO4)3.

When octane (C8H18)is burned in a particular internal combustion engine, the yield of products (carbon dioxide and water)is 93%.What mass of carbon dioxide will be produced in this engine when 15.0 g of octane is burned with 15.0 g of oxygen gas?

Calculate the mass of N in 2.34 g of N2H4?

Ammonia reacts with oxygen to form nitric oxide and water vapor: 4NH3 + 5O2 →\rarr→ 4NO + 6H2O When 20.0 g NH3 and 50.0 g O2 are allowed to react, which is the limiting reagent?

Balance the following and list the coefficients in order from left to right. ___ Cr + ___ H2SO4 →\rarr→ ___ Cr2(SO4)3 + ___ H2

Hydrogen gas is reacted with nitrogen gas to form ammonia gas.Write the balanced reaction (omit state symbols (s), (l), (g), (aq), etc.).

The empirical formula of a compound of uranium and fluorine that is composed of 67.6% uranium and 32.4% fluorine is

How many moles of C are in 1.22 moles of C6H12O6?

In the Haber process, hydrogen gas reacts with nitrogen gas to produce ammonia.How many kilograms of hydrogen would be required to react completely with 1.0 kg of nitrogen, and how many kilograms of ammonia would be formed?

What is the theoretical yield of PI3 from the reaction of 27.0 g of P and 68.0 g of I2? 2P(s)+ 3I2(s) →\rarr→ 2PI3(s)

Ammonia is reacted with sulfuric acid to form ammonium sulfate.Write the balanced reaction (omit state symbols (s), (l), (g), (aq), etc.).

What is the limiting reagent when 27.0 g of P and 68.0 g of I2 react according to the following chemical equation? 2P(s)+ 3I2(s) →\rarr→ 2PI3(s)

Calculate the molecular mass of menthol, C10H20O.

Zircon is a mineral with the empirical formula ZrSiO4.If all the zirconium is 90Zr, all the silicon is 28Si, and all the oxygen is 16O, what mass of oxygen is present in 10.g of zircon?

What is the minimum mass of oxygen gas necessary to produce 200.g of sulfuric acid in the following reaction? 2SO2 + O2 + 2 H2O →\rarr→ 2H2SO4

Chemistry: the Study of Change

Atoms, Molecules, and Ions

Reactions in Aqueous Solutions

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Thermochemistry

Quantum Theory and the Electronic Structure of Atoms

Periodic Relationships Among the Elements

Chemical Bonding I: Basic Concepts

Chemical Bonding Ii: Molecular Geometry and Hybridization of Atomic Orbitals

Intermolecular Forces and Liquids and Solids

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Entropy Free Energy and Equilibrium

Electrochemistry

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Chemistry in the Atmosphere

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Nonmetallic Elements and Their Compounds

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What is the mass of 3.50 x 10²⁴ Ti atoms?

When a 0.860 g sample of an organic compound containing C, H, and O was burned completely in oxygen, 1.64 g of CO₂ and 1.01 g of H₂O were produced.What is the empirical formula of the compound?

Calculate the molar mass, in g/mol, of Al₂(SO₄)₃.

When octane (C₈H₁₈)is burned in a particular internal combustion engine, the yield of products (carbon dioxide and water)is 93%.What mass of carbon dioxide will be produced in this engine when 15.0 g of octane is burned with 15.0 g of oxygen gas?

Calculate the mass of N in 2.34 g of N₂H₄?

Ammonia reacts with oxygen to form nitric oxide and water vapor: 4NH₃ + 5O₂ $\rarr$ 4NO + 6H₂O When 20.0 g NH₃ and 50.0 g O₂ are allowed to react, which is the limiting reagent?

Balance the following and list the coefficients in order from left to right. _ Cr + _ H₂SO₄ $\rarr$ _ Cr₂(SO₄)₃+ _ H₂

How many moles of C are in 1.22 moles of C₆H₁₂O₆?

What is the theoretical yield of PI₃ from the reaction of 27.0 g of P and 68.0 g of I₂? 2P(s)+ 3I₂(s) $\rarr$ 2PI₃(s)

What is the limiting reagent when 27.0 g of P and 68.0 g of I₂ react according to the following chemical equation? 2P(s)+ 3I₂(s) $\rarr$ 2PI₃(s)

Calculate the molecular mass of menthol, C₁₀H₂₀O.

Zircon is a mineral with the empirical formula ZrSiO₄.If all the zirconium is ⁹⁰Zr, all the silicon is ²⁸Si, and all the oxygen is ¹⁶O, what mass of oxygen is present in 10.g of zircon?

What is the minimum mass of oxygen gas necessary to produce 200.g of sulfuric acid in the following reaction? 2SO₂ + O₂ + 2 H₂O $\rarr$ 2H₂SO₄