Question 1

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 A

Question 2

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

Question 3

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

Question 4

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% 
A)  33% 
B)  49% 
C)  62% 
D)  77% 
E)  100%

Question 5

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

Question 6

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 
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

Question 7

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

Question 8

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)  C3H6Cl 
A)  CHCl 
B)  C9H18Cl3 
C)  C6H12Cl 
D)  C6H12Cl2 
E)  C3H6Cl

Question 9

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 g 
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 g

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

Question 11

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

Question 12

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 m 
A)  2630 m 
B)  3.69 m 
C)  251 m 
D)  14.8 m 
E)  62.7 m

Question 13

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. $\begin{array}{|l|l|l|}
\hline \text { Isotope } & \text { mass }(\mathrm{amu}) & \text { abundance } \
\hline{ }^{58} \mathrm{Ni} & 57.9354 & 67.76 \% \
\hline{ }^{60} \mathrm{Ni} & 59.9308 & 26.16 \% \
\hline{ }^{61} \mathrm{Ni} & 60.9311 & 1.25 \% \
\hline{ }^{62} \mathrm{Ni} & 61.9283 & 3.66 \% \
\hline{ }^{64} \mathrm{Ni} & 63.9280 & 1.16 \% \
\hline
\end{array}$ 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 
A)  60.45 amu 
B)  58.70 amu 
C)  59.75 amu 
D)  58.10 amu 
E)  59.25 amu

Question 14

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 
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

Question 15

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 16

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 atoms 
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 atoms

Question 17

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 
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

Question 18

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

Question 19

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

Question 20

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 above 
A)  0.42 mole 
B)  0.65 mole 
C)  0.56 mole 
D)  0.24 mole 
E)  None of the above

Exam 3: Mass Relationships in Chemical Reactions

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)

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

What is the molecular mass of Br2

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

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

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

What is the molar mass of acetaminophen, C8H9NO2

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.

What is the mass of 4.50 x 1022 Cu atoms

How many moles of H are in 4.56 moles of NH2NH2

Calculate the mass of C in 5.46 g of C2H4

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)

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

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

How many Br atoms are in 2.50 g of Br

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

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

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

Chemistry: The Study of Change

Atoms Molecules and Ions

Reactions in Aqueous Solutions

Gases

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

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

Nuclear Chemistry

Chemistry in the Atmosphere

Metallurgy and the Chemistry of Metals

Nonmetallic Elements and Their Compounds

Transition Metals Chemistry and Coordination Compounds

Organic Chemistry

Synthetic and Natural Organic Polymers

Filters

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)

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

What is the molecular mass of Br₂

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

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

What is the molar mass of acetaminophen, C₈H₉NO₂

What is the mass of 4.50 x 10²² Cu atoms

How many moles of H are in 4.56 moles of NH₂NH₂

Calculate the mass of C in 5.46 g of C₂H₄

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)

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

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