Question 1

How many grams of water could be made from 5.0 mol H2 and 3.0 mol O2?

Accepted Answer

A) 90.g 
B) 36 g 
C) 42 g 
D) 45 g 
E) 108 g 
A) 90.g 
B) 36 g 
C) 42 g 
D) 45 g 
E) 108 g

Question 2

A mass spectrometer works by ionizing atoms or molecules, and then accelerating them past oppositely charged plates.The mass is obtained by

Accepted Answer

A) measuring the force of impact on a detecting screen, and then calculating the mass using force = mass $\times$ acceleration. 
B) suspending the ions in an applied electric field, and then calculating mass by the setting the downward gravitational force equal to the upward electrostatic force. 
C) measuring the magnitude of deflection as the ions pass through a magnetic field to obtain the charge-to-mass ratio, and then calculating the mass from that ratio. 
D) measuring the time it takes for the ions to hit the detector at a known distance to calculate the acceleration, and then calculating mass from force = mass $\times$ acceleration. 
A) measuring the force of impact on a detecting screen, and then calculating the mass using force = mass $\times$ acceleration. 
B) suspending the ions in an applied electric field, and then calculating mass by the setting the downward gravitational force equal to the upward electrostatic force. 
C) measuring the magnitude of deflection as the ions pass through a magnetic field to obtain the charge-to-mass ratio, and then calculating the mass from that ratio. 
D) measuring the time it takes for the ions to hit the detector at a known distance to calculate the acceleration, and then calculating mass from force = mass $\times$ acceleration.

Question 3

A copper wire has a diameter of 2.00 mm. What length of this wire contains exactly 1.00 mol of copper? (density of Cu = 8.92 g/cm3)

Accepted Answer

A) 0.178 m 
B) 0.567 m 
C) 180 m 
D) 45.1 m 
E) 2.27 m 
A) 0.178 m 
B) 0.567 m 
C) 180 m 
D) 45.1 m 
E) 2.27 m

Question 4

Balance the following chemical equation:
NaNO3 $\rarr$NaNO2 + O2

Accepted Answer

Question 5

Chlorine gas can be made from the reaction of manganese dioxide with hydrochloric acid. MnO2(s)+ 4HCl(aq)$\rarr$MnCl2(aq)+ 2H2O(l)+ Cl2(g)
According to the above reaction, which is the limiting reagent when 28 g of MnO2 are reacted with 42 g of HCl?

Accepted Answer

A) MnO2 
B) HCl 
C) MnCl2 
D) Cl2 
E) No reagent is limiting. 
A) MnO2 
B) HCl 
C) MnCl2 
D) Cl2 
E) No reagent is limiting.

Question 6

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

Question 7

Liquid heptane, C7H16 , burns in oxygen gas to yield carbon dioxide and water. What mass of carbon dioxide is produced when 15.0 mL of heptane burns completely? (density of heptane = 0.6838 g/mL)

Accepted Answer

A) 46.1 g 
B) 71.8 g 
C) 4.49 g 
D) 6.59 g 
E) 31.5 g 
A) 46.1 g 
B) 71.8 g 
C) 4.49 g 
D) 6.59 g 
E) 31.5 g

Question 8

An organic thiol compound is 38.66% C, 9.73% H, and 51.61% S by mass.What is the empirical formula of this compound?

Accepted Answer

A) C2H6S 
B) C3H8S 
C) C4H10S 
D) C4H12S 
E) C5H14S 
A) C2H6S 
B) C3H8S 
C) C4H10S 
D) C4H12S 
E) C5H14S

Question 9

The percent composition by mass of a compound is 76.0% C, 12.8% H, and 11.2% O.The molar mass of this compound is 284.5 g/mol.What is the molecular formula of the compound?

Accepted Answer

A) C10H6O 
B) C9H18O 
C) C16H28O4 
D) C20H12O2 
E) C18H36O2 
A) C10H6O 
B) C9H18O 
C) C16H28O4 
D) C20H12O2 
E) C18H36O2

Question 10

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 11

Define a mole.

Accepted Answer

An Avogadro's number

Question 12

What is the maximum number of grams of ammonia, NH3, that can be obtained from the reaction of 10.0 g of H2 and 80.0 g of N2? 
N2 + 3H2 $\rarr$2NH3

Accepted Answer

A) 28.4 g 
B) 48.6 g 
C) 56.7 g 
D) 90.0 g 
E) 97.1 g 
A) 28.4 g 
B) 48.6 g 
C) 56.7 g 
D) 90.0 g 
E) 97.1 g

Question 13

How many moles of CF4 are there in 171 g of CF4?

Accepted Answer

A) 0.51 mol 
B) 1.94 mol 
C) 4.07 mol 
D) 88.0 mol 
E) 171 mol 
A) 0.51 mol 
B) 1.94 mol 
C) 4.07 mol 
D) 88.0 mol 
E) 171 mol

Question 14

Calculate the molecular mass, in g/mol, of H2SO4.

Accepted Answer

Question 15

What is the mass of 8.25 * 1019 UF6 molecules?

Accepted Answer

A) 352 g 
B) 0.0482 g 
C) 1.37 * 10-4 g 
D) 2.90 * 1022 g 
E) 8.25 * 1019 g 
A) 352 g 
B) 0.0482 g 
C) 1.37 * 10-4 g 
D) 2.90 * 1022 g 
E) 8.25 * 1019 g

Question 16

What is the coefficient of H2O when the following equation is properly balanced with the smallest set of whole numbers?
 ___ Na + ___ H2O $\rarr$ ___ NaOH + ___ H2

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
E) 5 
A) 1 
B) 2 
C) 3 
D) 4 
E) 5

Question 17

A silver wire has a diameter of 0.500 mm. What length of this wire contains exactly 1.00 mol of silver? (density of Ag = 10.5 g/cm3)

Accepted Answer

A) 52.3 m 
B) 222 m 
C) 13.1 m 
D) 2.01 m 
E) 890 m 
A) 52.3 m 
B) 222 m 
C) 13.1 m 
D) 2.01 m 
E) 890 m

Question 18

When a chemical equation is balanced, it will have a set of whole number coefficients that cannot be reduced to smaller whole numbers. What is the coefficient for O2 when the following combustion reaction of a hydrocarbon is balanced? ___ C7H14 + ___ O2 $\rarr$ ___ CO2 + ___ H2O

Accepted Answer

A) 42 
B) 21 
C) 11 
D) 10 
E) none of these 
A) 42 
B) 21 
C) 11 
D) 10 
E) none of these

Question 19

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 20

Liquid hexane, C6H14, burns in oxygen gas to yield carbon dioxide and water. What is the minimum mass of oxygen required for the complete reaction of 10.0 mL of hexane? (density of hexane = 0.660 g/mL)

Accepted Answer

A) 3.71 g 
B) 2.45 g 
C) 23.3 g 
D) 46.6 g 
E) 35.3 g 
A) 3.71 g 
B) 2.45 g 
C) 23.3 g 
D) 46.6 g 
E) 35.3 g

Exam 3: Mass Relationships in Chemical Reactions

How many grams of water could be made from 5.0 mol H2 and 3.0 mol O2?

A mass spectrometer works by ionizing atoms or molecules, and then accelerating them past oppositely charged plates.The mass is obtained by

A copper wire has a diameter of 2.00 mm. What length of this wire contains exactly 1.00 mol of copper? (density of Cu = 8.92 g/cm3)

Balance the following chemical equation: NaNO3 →\rarr→ NaNO2 + O2

Chlorine gas can be made from the reaction of manganese dioxide with hydrochloric acid. MnO2(s)+ 4HCl(aq) →\rarr→ MnCl2(aq)+ 2H2O(l)+ Cl2(g) According to the above reaction, which is the limiting reagent when 28 g of MnO2 are reacted with 42 g of HCl?

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?

Liquid heptane, C7H16 , burns in oxygen gas to yield carbon dioxide and water. What mass of carbon dioxide is produced when 15.0 mL of heptane burns completely? (density of heptane = 0.6838 g/mL)

An organic thiol compound is 38.66% C, 9.73% H, and 51.61% S by mass.What is the empirical formula of this compound?

The percent composition by mass of a compound is 76.0% C, 12.8% H, and 11.2% O.The molar mass of this compound is 284.5 g/mol.What is the molecular formula of the compound?

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)

Define a mole.

What is the maximum number of grams of ammonia, NH3, that can be obtained from the reaction of 10.0 g of H2 and 80.0 g of N2? N2 + 3H2 →\rarr→ 2NH3

How many moles of CF4 are there in 171 g of CF4?

Calculate the molecular mass, in g/mol, of H2SO4.

What is the mass of 8.25 * 1019 UF6 molecules?

What is the coefficient of H2O when the following equation is properly balanced with the smallest set of whole numbers? ___ Na + ___ H2O →\rarr→ ___ NaOH + ___ H2

A silver wire has a diameter of 0.500 mm. What length of this wire contains exactly 1.00 mol of silver? (density of Ag = 10.5 g/cm3)

When a chemical equation is balanced, it will have a set of whole number coefficients that cannot be reduced to smaller whole numbers. What is the coefficient for O2 when the following combustion reaction of a hydrocarbon is balanced? ___ C7H14 + ___ O2 →\rarr→ ___ CO2 + ___ H2O

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?

Liquid hexane, C6H14, burns in oxygen gas to yield carbon dioxide and water. What is the minimum mass of oxygen required for the complete reaction of 10.0 mL of hexane? (density of hexane = 0.660 g/mL)

Chemistry: The Study of Change

Atoms, Molecules, and Ions

Reactions in Aqueous Solution

Gases

Thermo-Chemistry

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

Chemistry in the Atmosphere

Entropy, Free Energy, and Equilibrium

Electrochemistry

Metallurgy and the Chemistry of Metals

Nonmetallic Elements and Their Compounds

Transition Metal Chemistry and Coordination Compounds

Nuclear Chemistry

Organic Chemistry

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Filters

How many grams of water could be made from 5.0 mol H₂ and 3.0 mol O₂?

A copper wire has a diameter of 2.00 mm. What length of this wire contains exactly 1.00 mol of copper? (density of Cu = 8.92 g/cm³)

Balance the following chemical equation: NaNO₃ $\rarr$ NaNO₂ + O₂

Chlorine gas can be made from the reaction of manganese dioxide with hydrochloric acid. MnO₂(s)+ 4HCl(aq) $\rarr$ MnCl₂(aq)+ 2H₂O(l)+ Cl₂(g) According to the above reaction, which is the limiting reagent when 28 g of MnO₂ are reacted with 42 g of HCl?

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?

Liquid heptane, C₇H₁₆, burns in oxygen gas to yield carbon dioxide and water. What mass of carbon dioxide is produced when 15.0 mL of heptane burns completely? (density of heptane = 0.6838 g/mL)

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)

What is the maximum number of grams of ammonia, NH₃, that can be obtained from the reaction of 10.0 g of H₂ and 80.0 g of N₂? N₂ + 3H₂ $\rarr$ 2NH₃

How many moles of CF₄ are there in 171 g of CF₄?

Calculate the molecular mass, in g/mol, of H₂SO₄.

What is the mass of 8.25 * 10¹⁹ UF₆ molecules?

What is the coefficient of H₂O when the following equation is properly balanced with the smallest set of whole numbers? _ Na + _ H₂O $\rarr$ _ NaOH + _ H₂

A silver wire has a diameter of 0.500 mm. What length of this wire contains exactly 1.00 mol of silver? (density of Ag = 10.5 g/cm³)

When a chemical equation is balanced, it will have a set of whole number coefficients that cannot be reduced to smaller whole numbers. What is the coefficient for O₂ when the following combustion reaction of a hydrocarbon is balanced? _ C₇H₁₄ + _ O₂ $\rarr$ _ CO₂ + _ H₂O

Liquid hexane, C₆H₁₄, burns in oxygen gas to yield carbon dioxide and water. What is the minimum mass of oxygen required for the complete reaction of 10.0 mL of hexane? (density of hexane = 0.660 g/mL)