Question 1

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 mF) All of the above
G) B) and C)

Question 2

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 3

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 molF) A) and D)
G) D) and E)

Question 4

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 gF) C) and E)
G) A) and B)

Question 5

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 F) A) and B)
G) None of the above

Question 6

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 F) B) and C)
G) A) and E)

Question 7

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 gF) B) and D)
G) C) and E)

Question 8

Define a mole.

Accepted Answer

An Avogadro's number...

Question 9

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 F) A) and B)
G) D) and E)

Question 10

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

Accepted Answer

Question 11

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.gF) A) and E)
G) B) and E)

Question 12

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)  C5H14SF) C) and E)
G) A) and E)

Question 13

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

Accepted Answer

Question 14

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 15

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 mF) A) and C)
G) None of the above

Question 16

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. F) B) and E)
G) A) and C)

Question 17

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)  C18H36O2F) All of the above
G) C) and E)

Question 18

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 gF) None of the above
G) C) and D)

Question 19

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  ×	imes×  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  ×	imes×  acceleration. E) All of the above
F) A) and B)

Question 20

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 gF) A) and C)
G) A) and B)

Exam 3: Mass Relationships in Chemical Reactions

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?

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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)

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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?

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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?

Correct Answerverified0.22 kg hydrogen req...View AnswerShow Answer

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)

Correct AnswerverifiedShow Answer

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

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What is the mass of 8.25 * 1019 UF6 molecules?

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

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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

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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

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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)

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

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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)

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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?

Correct AnswerverifiedShow Answer

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)

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

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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?

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Define a mole.

Correct AnswerverifiedAn Avogadro's number...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

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?

Correct Answer
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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)

Correct Answer
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Correct Answer
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Correct Answer
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0.22 kg hydrogen req...
View Answer

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)

Correct Answer
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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

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What is the mass of 8.25 * 10¹⁹ UF₆ molecules?

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

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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

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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

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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)

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

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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)

Correct Answer
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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?

Correct Answer
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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)

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

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Correct Answer
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Correct Answer
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An Avogadro's number...
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How many grams of water could be made from 5.0 mol H₂ and 3.0 mol O₂?

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