Question 1

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

Question 2

A 0.8715 g sample of sorbic acid, a compound first obtained from the berries of a certain ash tree, is burned completely in oxygen to give 2.053 g of carbon dioxide and 0.5601 g of water. The empirical formula of sorbic acid is

Accepted Answer

A)   CH2O.
B)   C3H4O.
C)   CH4O3.
D)   C3H4O2.
E)   C2H4O2.F) C) and D)
G) C) and E)

Question 3

Calculate the mass of C in 5.46 g of C2H4

Accepted Answer

A)   0.455 g C
B)   4.68 g C
C)   65.6 g C
D)   13.1 g C
E)   24.0 g CF) A) and B)
G) A) and C)

Question 4

Lithium metal reacts with nitrogen gas to form lithium nitride. Identify the balanced reaction that describes this process.

Accepted Answer

A)   Li + N  →\rarr→  LiN
B)   Li + N2  →\rarr→  LiN2
C)   2Li + N2  →\rarr→  Li2N2
D)   6Li + N2  →\rarr→  2Li3N
E)   2Li + N2  →\rarr→  2LiN F) A) and E)
G) None of the above

Question 5

How many molecules are there in 8.0 g of ozone, O3

Accepted Answer

A)   3.0 molecules
B)   3.6 * 1024 molecules
C)   1.0 * 1023 molecules
D)   3.0 * 1023 molecules
E)   6.0 * 1023 moleculesF) B) and C)
G) A) and E) C

Question 6

The first step in the Ostwald process for producing nitric acid is 4NH3(g)  + 5O2(g)   →\rarr→  4NO(g)  + 6H2O(g) .If the reaction of 150. g of ammonia with 150. g of oxygen gas yields 87. g of nitric oxide (NO) , what is the percent yield of this reaction

Accepted Answer

A)   33%
B)   49%
C)   62%
D)   77%
E)   100% F) All of the above
G) A) and B)

Question 7

How many moles of aluminum are present in an Al cylinder with a mass of 15 g

Accepted Answer

A)   0.42 mole
B)   0.65 mole
C)   0.56 mole
D)   0.24 mole
E)   None of the aboveF) B) and E)
G) A) and E)

Question 8

Which one of the following is an example of a balanced chemical reaction

Accepted Answer

A)   HCl + KMnO4  →\rarr→  Cl2 + MnO2 + H2O + KCl
B)   HCl + KMnO4  →\rarr→  Cl2 + MnO2 + 2H2O + KCl
C)   2HCl + 2KMnO4  →\rarr→  Cl2 + MnO2 + 2H2O + 2KCl
D)   6HCl + 2KMnO4  →\rarr→ 2Cl2 + 2MnO2 + 4H2O + 2KCl
E)   8HCl + 2KMnO4  →\rarr→  3Cl2 + 2MnO2 + 4H2O + 2KCl F) B) and D)
G) B) and C)

Question 9

Balance the following equation and list the coefficients in order from left to right.
__ SF4 + __ H2O  →\rarr→ __ H2SO3 + __ HF

Accepted Answer

A)   1, 1, 1, 4.
B)   2, 6, 2, 8.
C)   1, 2, 1, 4 
D)   1, 3, 1, 4
E)   2, 3, 2, 8 F) C) and D)
G) A) and C)

Question 10

How many moles of H are in 4.56 moles of NH2NH2

Accepted Answer

A)   4.52 moles H
B)   4.56 moles H
C)   9.12 moles H
D)   18.39 moles H
E)   18.24 moles HF) A) and D)
G) B) and E)

Question 11

A gold wire has a diameter of 1.00 mm. What length of this wire contains exactly 1.00 mol of gold (density of Au = 17.0 g/cm3)

Accepted Answer

A)   2630 m
B)   3.69 m
C)   251 m
D)   14.8 m
E)   62.7 mF) A) and B)
G) All of the above

Question 12

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

Question 13

How many Br atoms are in 2.50 g of Br

Accepted Answer

A)  1.88 x 1022 Br atoms
B)   1.51 x 1024 Br atoms
C)   7.54 x 1021 Br atoms
D)   6.02 x 1023 Br atoms
E)   9.42 x 1021 Br atomsF) B) and E)
G) None of the above

Question 14

An unknown compound with a molar mass of 155.06 g/mol consists of 46.47% C, 7.80% H, and 45.72% Cl. Find the molecular formula for the compound.

Accepted Answer

A)   CHCl
B)   C9H18Cl3
C)   C6H12Cl
D)   C6H12Cl2
E)   C3H6ClF) All of the above
G) A) and D)

Question 15

How many moles of Cl atoms are there in 65.2 g CHCl3

Accepted Answer

A)   0.548 mol
B)   1.09 mol
C)   3.30 * 1023 mol
D)   1.64 mol
E)   3.00 molF) A) and B)
G) C) and E)

Question 16

What is the molar mass of acetaminophen, C8H9NO2

Accepted Answer

A)   151.16 g/mol
B)   43.03 g/mol
C)   67.09 g/mol
D)   143.10 g/mol
E)   135.16 g/molF) A) and C)
G) C) and E)

Question 17

The Hall process for the production of aluminum involves the reaction of aluminum oxide with elemental carbon to give aluminum metal and carbon monoxide. If the percent yield of this reaction is 82% and aluminum ore is 71% by mass aluminum oxide, what mass of aluminum ore must be mined in order to produce 1.0 * 103 kg (1 metric ton)  of aluminum metal by the Hall process

Accepted Answer

A)   1.1 * 103 kg
B)   1.6 * 103 kg
C)   1.8 * 103 kg
D)   2.2 * 103 kg
E)   3.3 * 103 kgF) A) and E)
G) A) and C)

Question 18

What is the mass of 4.50 x 1022 Cu atoms

Accepted Answer

A)   7.47 x 10-2 g
B)   7.47 x 10-2 amu
C)   4.75 g
D)   63.55 amu
E)   63.55 gF) B) and E)
G) C) and D)

Question 19

What is the molecular mass of Br2

Accepted Answer

A)   79.90 amu
B)   79.90 g
C)   159.8 amu
D)   159.8 g
E)   2.65 x 10-22 amuF) B) and D)
G) C) and D) C

Question 20

Nickel has a lower atomic mass than cobalt, even though it has a higher atomic number. One possible explanation is that one of the average atomic masses was miscalculated. In the case of cobalt, there is only one isotope: 100% 59Co at a mass of 58.9332 amu. For nickel, however, there are five isotopes as given in the table.   Isotope  mass (amu)  abundance 58Ni57.935467.76%60Ni59.930826.16%61Ni60.93111.25%62Ni61.92833.66%64Ni63.92801.16%\begin{array}{|l|l|l|}\hline 	ext { Isotope } & 	ext { mass }(\mathrm{amu})  & 	ext { abundance } \\hline{ }^{58} \mathrm{Ni} & 57.9354 & 67.76 \% \\hline{ }^{60} \mathrm{Ni} & 59.9308 & 26.16 \% \\hline{ }^{61} \mathrm{Ni} & 60.9311 & 1.25 \% \\hline{ }^{62} \mathrm{Ni} & 61.9283 & 3.66 \% \\hline{ }^{64} \mathrm{Ni} & 63.9280 & 1.16 \% \\hline\end{array} Isotope 58Ni60Ni61Ni62Ni64Ni​ mass (amu) 57.935459.930860.931161.928363.9280​ abundance 67.76%26.16%1.25%3.66%1.16%​​  Using the data in the table, what is the average atomic mass for nickel

Accepted Answer

A)   60.45 amu
B)   58.70 amu
C)   59.75 amu
D)   58.10 amu
E)   59.25 amu F) A) and E)
G) A) and D)

Exam 3: Mass Relationships in Chemical Reactions

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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A 0.8715 g sample of sorbic acid, a compound first obtained from the berries of a certain ash tree, is burned completely in oxygen to give 2.053 g of carbon dioxide and 0.5601 g of water. The empirical formula of sorbic acid is

Correct Answer
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Calculate the mass of C in 5.46 g of C₂H₄

Correct Answer
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Lithium metal reacts with nitrogen gas to form lithium nitride. Identify the balanced reaction that describes this process.

Correct Answer
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How many molecules are there in 8.0 g of ozone, O₃

Correct Answer
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C

The first step in the Ostwald process for producing nitric acid is 4NH₃(g) + 5O₂(g) $\rarr$ 4NO(g) + 6H₂O(g) .If the reaction of 150. g of ammonia with 150. g of oxygen gas yields 87. g of nitric oxide (NO) , what is the percent yield of this reaction

Correct Answer
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How many moles of aluminum are present in an Al cylinder with a mass of 15 g

Correct Answer
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Which one of the following is an example of a balanced chemical reaction

Correct Answer
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Balance the following equation and list the coefficients in order from left to right. SF₄ + H₂O $\rarr$ H₂SO₃ + HF

Correct Answer
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How many moles of H are in 4.56 moles of NH₂NH₂

Correct Answer
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A gold wire has a diameter of 1.00 mm. What length of this wire contains exactly 1.00 mol of gold (density of Au = 17.0 g/cm³)

Correct Answer
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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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A

How many Br atoms are in 2.50 g of Br

Correct Answer
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An unknown compound with a molar mass of 155.06 g/mol consists of 46.47% C, 7.80% H, and 45.72% Cl. Find the molecular formula for the compound.

Correct Answer
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How many moles of Cl atoms are there in 65.2 g CHCl₃

Correct Answer
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What is the molar mass of acetaminophen, C₈H₉NO₂

Correct Answer
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Correct Answer
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What is the mass of 4.50 x 10²² Cu atoms

Correct Answer
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What is the molecular mass of Br₂

Correct Answer
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C

Correct Answer
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Exam 3: Mass Relationships in Chemical Reactions

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

A 0.8715 g sample of sorbic acid, a compound first obtained from the berries of a certain ash tree, is burned completely in oxygen to give 2.053 g of carbon dioxide and 0.5601 g of water. The empirical formula of sorbic acid is

Correct AnswerverifiedShow Answer

Calculate the mass of C in 5.46 g of C2H4

Correct AnswerverifiedShow Answer

Lithium metal reacts with nitrogen gas to form lithium nitride. Identify the balanced reaction that describes this process.

Correct AnswerverifiedShow Answer

How many molecules are there in 8.0 g of ozone, O3

Correct AnswerverifiedC

The first step in the Ostwald process for producing nitric acid is 4NH3(g) + 5O2(g) →\rarr→ 4NO(g) + 6H2O(g) .If the reaction of 150. g of ammonia with 150. g of oxygen gas yields 87. g of nitric oxide (NO) , what is the percent yield of this reaction

Correct AnswerverifiedShow Answer

How many moles of aluminum are present in an Al cylinder with a mass of 15 g

Correct AnswerverifiedShow Answer

Which one of the following is an example of a balanced chemical reaction

Correct AnswerverifiedShow Answer

Balance the following equation and list the coefficients in order from left to right. __ SF4 + __ H2O →\rarr→ __ H2SO3 + __ HF

Correct AnswerverifiedShow Answer

How many moles of H are in 4.56 moles of NH2NH2

Correct AnswerverifiedShow Answer

A gold wire has a diameter of 1.00 mm. What length of this wire contains exactly 1.00 mol of gold (density of Au = 17.0 g/cm3)

Correct AnswerverifiedShow Answer

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 AnswerverifiedA

How many Br atoms are in 2.50 g of Br

Correct AnswerverifiedShow Answer

An unknown compound with a molar mass of 155.06 g/mol consists of 46.47% C, 7.80% H, and 45.72% Cl. Find the molecular formula for the compound.

Correct AnswerverifiedShow Answer

How many moles of Cl atoms are there in 65.2 g CHCl3

Correct AnswerverifiedShow Answer

What is the molar mass of acetaminophen, C8H9NO2

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

What is the mass of 4.50 x 1022 Cu atoms

Correct AnswerverifiedShow Answer

What is the molecular mass of Br2

Correct AnswerverifiedC

Correct AnswerverifiedShow Answer

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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Correct Answer
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Calculate the mass of C in 5.46 g of C₂H₄

Correct Answer
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Correct Answer
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How many molecules are there in 8.0 g of ozone, O₃

Correct Answer
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C

The first step in the Ostwald process for producing nitric acid is 4NH₃(g) + 5O₂(g) $\rarr$ 4NO(g) + 6H₂O(g) .If the reaction of 150. g of ammonia with 150. g of oxygen gas yields 87. g of nitric oxide (NO) , what is the percent yield of this reaction

Correct Answer
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Correct Answer
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Correct Answer
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Balance the following equation and list the coefficients in order from left to right. SF₄ + H₂O $\rarr$ H₂SO₃ + HF

Correct Answer
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How many moles of H are in 4.56 moles of NH₂NH₂

Correct Answer
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A gold wire has a diameter of 1.00 mm. What length of this wire contains exactly 1.00 mol of gold (density of Au = 17.0 g/cm³)

Correct Answer
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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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A

Correct Answer
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Correct Answer
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How many moles of Cl atoms are there in 65.2 g CHCl₃

Correct Answer
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What is the molar mass of acetaminophen, C₈H₉NO₂

Correct Answer
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Correct Answer
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What is the mass of 4.50 x 10²² Cu atoms

Correct Answer
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What is the molecular mass of Br₂

Correct Answer
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C

Correct Answer
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