Question 1

The element in C7H₅NO₃ whose % composition is 31.8% is ________.

Accepted Answer

A)  carbon 
B)  hydrogen 
C)  nitrogen 
D)  oxygen 
A)  carbon 
B)  hydrogen 
C)  nitrogen 
D)  oxygen

Question 2

A certain compound has the following composition: C= 40.0% and H= 6.7%. The empirical formula is ________.

Accepted Answer

A)  CH 
B)  CH₂O 
C)  C₆H₆O 
D)  CHO 
A)  CH 
B)  CH₂O 
C)  C₆H₆O 
D)  CHO

Question 3

Which of the following does not have the same number atoms as the other three choices?

Accepted Answer

A)  three moles Na₂SO₃ 
B)  six moles of water 
C)  nine moles NaCl 
D)  five moles CH₄ 
A)  three moles Na₂SO₃ 
B)  six moles of water 
C)  nine moles NaCl 
D)  five moles CH₄

Question 4

A lead-sulfur compound contains 86.6% Pb. Its empirical formula is PbS2.

Accepted Answer

A) True 
 B)False

Question 5

What is the molecular formula of a compound that weighs 46 g/mol and analyzes to 52.2% C, 34.8% O, and 13% H?

Accepted Answer

A)  C₃H₂O₂ 
B)  C₂H₆O 
C)  CH₃O 
D)  C₂H₅O₂ 
A)  C₃H₂O₂ 
B)  C₂H₆O 
C)  CH₃O 
D)  C₂H₅O₂

Question 6

One molecule of oxygen gas has fewer atoms than one mole of ozone gas.

Accepted Answer

A) True 
 B)False

Question 7

The molar mass of a compound AL₂(XO₄)3 is 342. The atomic mass of X is ________, which is ________.

Accepted Answer

A)  31; P 
B)  32; S 
C)  52; Cr 
D)  55; Mn 
A)  31; P 
B)  32; S 
C)  52; Cr 
D)  55; Mn

Question 8

Match each compound with its corresponding percent of oxygen.
-C?H8N?O?S

Accepted Answer

A) 50.0% 
B) 26.1% 
C) 43.8% 
D) 18.6% 
E) 27.6% 
A) 50.0% 
B) 26.1% 
C) 43.8% 
D) 18.6% 
E) 27.6%

Question 9

The reaction was performed in the lab and 50.1 g of CO₂ was collected from the reaction of 78.1 g of O₂ with 62.4 g of C₄H₁₀. The percent yield of this reaction is ________. 2 C₄H₁₀ + 13 O₂ → 8 CO₂ + 10 H₂O

Accepted Answer

A)  11.7 % 
B)  13.3 % 
C)  26.5 % 
D)  35.7 % 
E)  75.8 % 
A)  11.7 % 
B)  13.3 % 
C)  26.5 % 
D)  35.7 % 
E)  75.8 %

Question 10

Which statement is true when comparing acetic acid C₂H₄O₂ and formaldehyde CH₂O?

Accepted Answer

A)  Their empirical formulas are identical. 
B)  Their molecular formulas are identical. 
C)  Their molecular formulas are different. 
D)  both A and C 
A)  Their empirical formulas are identical. 
B)  Their molecular formulas are identical. 
C)  Their molecular formulas are different. 
D)  both A and C

Question 11

The theoretical number of moles of water produced from 4 moles of sulfuric acid is ________. H₂SO₄ + Cu → SO₂ + H₂O + CuSO₄

Accepted Answer

A)  2 
B)  4 
C)  6 
D)  8 
A)  2 
B)  4 
C)  6 
D)  8

Question 12

The maximum number of moles of carbon dioxide that can be produced from four moles of C₃H8O is ________. 2 C₃H8O + 9 O₂ → 6 CO₂ + 8 H₂O

Accepted Answer

A)  4 
B)  6 
C)  8 
D)  12 
A)  4 
B)  6 
C)  8 
D)  12

Question 13

16 g of oxygen gas is equal to ________.

Accepted Answer

A)  the mass of one atom 
B)  the mass of one molecule 
C)  the mass of one mole 
D)  the mass of half a mole 
A)  the mass of one atom 
B)  the mass of one molecule 
C)  the mass of one mole 
D)  the mass of half a mole

Question 14

Combustion of 5.00 mg of a compound produces 9.60 mg of carbon dioxide and 5.90 mg of water. The empirical formula is ________.

Accepted Answer

A)  CH₂O 
B)  C₂H₅ 
C)  C₂H₆O 
D)  C₄H₁₀O 
A)  CH₂O 
B)  C₂H₅ 
C)  C₂H₆O 
D)  C₄H₁₀O

Question 15

Match each compound with its corresponding percent of oxygen.
-(NH?)2CO?

Accepted Answer

A) 50.0% 
B) 26.1% 
C) 43.8% 
D) 18.6% 
E) 27.6% 
A) 50.0% 
B) 26.1% 
C) 43.8% 
D) 18.6% 
E) 27.6%

Question 16

Which of the following has the highest percent of oxygen?

Accepted Answer

A)  N₂O 
B)  AL₂O₃ 
C)  K₂CO₃ 
D)  KMnO₄ 
A)  N₂O 
B)  AL₂O₃ 
C)  K₂CO₃ 
D)  KMnO₄

Question 17

Which of the following compounds has its oxygen composition equal to 50.0%?

Accepted Answer

A)  (NH₄)2CO₃ 
B)  CH₂O₂ 
C)  C₂H₃NO₂ 
D)  C₁₀H₂₀ONS 
A)  (NH₄)2CO₃ 
B)  CH₂O₂ 
C)  C₂H₃NO₂ 
D)  C₁₀H₂₀ONS

Question 18

Which of the following pairs does not share the same molecular mass when rounded to the nearest whole number?

Accepted Answer

A)  CH₃OH and oxygen gas 
B)  CO and nitrogen gas 
C)  C₂H₆O and C₂H₄O₂ 
D)  C₄H₁₀O and C₃H₆O₂ 
A)  CH₃OH and oxygen gas 
B)  CO and nitrogen gas 
C)  C₂H₆O and C₂H₄O₂ 
D)  C₄H₁₀O and C₃H₆O₂

Question 19

Match each compound with its corresponding percent of carbon.
-C?H8N?O?S

Accepted Answer

A) 48.6% 
B) 55.6% 
C) 69.0% 
D) 33.6% 
E) 41.8% 
A) 48.6% 
B) 55.6% 
C) 69.0% 
D) 33.6% 
E) 41.8%

Question 20

Which contains the highest percentage of hydrogen?

Accepted Answer

A)  HCl 
B)  H₂SO₄ 
C)  H₃PO₄ 
D)  H₂O 
A)  HCl 
B)  H₂SO₄ 
C)  H₃PO₄ 
D)  H₂O

The element in C₇H₅NO₃ whose % composition is 31.8% is ________.

A certain compound has the following composition: C= 40.0% and H= 6.7%. The empirical formula is ________.

Which of the following does not have the same number atoms as the other three choices?

A lead-sulfur compound contains 86.6% Pb. Its empirical formula is PbS₂.

What is the molecular formula of a compound that weighs 46 g/mol and analyzes to 52.2% C, 34.8% O, and 13% H?

One molecule of oxygen gas has fewer atoms than one mole of ozone gas.

The molar mass of a compound AL₂(XO₄)₃ is 342. The atomic mass of X is , which is .

Match each compound with its corresponding percent of oxygen. -C?H₈N?O?S

The reaction was performed in the lab and 50.1 g of CO₂ was collected from the reaction of 78.1 g of O₂ with 62.4 g of C₄H₁₀. The percent yield of this reaction is ________. 2 C₄H₁₀ + 13 O₂ → 8 CO₂ + 10 H₂O

Which statement is true when comparing acetic acid C₂H₄O₂ and formaldehyde CH₂O?

The theoretical number of moles of water produced from 4 moles of sulfuric acid is ________. H₂SO₄ + Cu → SO₂ + H₂O + CuSO₄

The maximum number of moles of carbon dioxide that can be produced from four moles of C₃H₈O is ________. 2 C₃H₈O + 9 O₂ → 6 CO₂ + 8 H₂O

16 g of oxygen gas is equal to ________.

Combustion of 5.00 mg of a compound produces 9.60 mg of carbon dioxide and 5.90 mg of water. The empirical formula is ________.

Match each compound with its corresponding percent of oxygen. -(NH?)2CO?

Which of the following has the highest percent of oxygen?

Which of the following compounds has its oxygen composition equal to 50.0%?

Which of the following pairs does not share the same molecular mass when rounded to the nearest whole number?

Match each compound with its corresponding percent of carbon. -C?H₈N?O?S

Which contains the highest percentage of hydrogen?

What Is Chemistry

The Numerical Side of Chemistry

The Evolution of Atomic Theory

The Modern Model of the Atom

Chemical Bonding and Nomenclature

The Shape of Molecules

Intermolecular Forces and the Phases of Matter

Chemical Reactions

Electron Transfer in Chemical Reactions

What If There Were No Intermolecular Forces - the Ideal Gas

Solutions

When Reactants Turn Into Products

Chemical Equilibrium

Electrolytes, Acids, and Bases

Nuclear Chemistry

The Chemistry of Carbon

Synthetic and Biological Polymers

Filters

Exam 9: Stoichiometry and the Mole

The element in C7H₅NO₃ whose % composition is 31.8% is ________.

A certain compound has the following composition: C= 40.0% and H= 6.7%. The empirical formula is ________.

Which of the following does not have the same number atoms as the other three choices?

A lead-sulfur compound contains 86.6% Pb. Its empirical formula is PbS2.

What is the molecular formula of a compound that weighs 46 g/mol and analyzes to 52.2% C, 34.8% O, and 13% H?

One molecule of oxygen gas has fewer atoms than one mole of ozone gas.

The molar mass of a compound AL₂(XO₄)3 is 342. The atomic mass of X is ________, which is ________.

Match each compound with its corresponding percent of oxygen. -C?H8N?O?S

The reaction was performed in the lab and 50.1 g of CO₂ was collected from the reaction of 78.1 g of O₂ with 62.4 g of C₄H₁₀. The percent yield of this reaction is ________. 2 C₄H₁₀ + 13 O₂ → 8 CO₂ + 10 H₂O

Which statement is true when comparing acetic acid C₂H₄O₂ and formaldehyde CH₂O?

The theoretical number of moles of water produced from 4 moles of sulfuric acid is ________. H₂SO₄ + Cu → SO₂ + H₂O + CuSO₄

The maximum number of moles of carbon dioxide that can be produced from four moles of C₃H8O is ________. 2 C₃H8O + 9 O₂ → 6 CO₂ + 8 H₂O

16 g of oxygen gas is equal to ________.

Combustion of 5.00 mg of a compound produces 9.60 mg of carbon dioxide and 5.90 mg of water. The empirical formula is ________.

Match each compound with its corresponding percent of oxygen. -(NH?)2CO?

Which of the following has the highest percent of oxygen?

Which of the following compounds has its oxygen composition equal to 50.0%?

Which of the following pairs does not share the same molecular mass when rounded to the nearest whole number?

Match each compound with its corresponding percent of carbon. -C?H8N?O?S

Which contains the highest percentage of hydrogen?

What Is Chemistry

The Numerical Side of Chemistry

The Evolution of Atomic Theory

The Modern Model of the Atom

Chemical Bonding and Nomenclature

The Shape of Molecules

Intermolecular Forces and the Phases of Matter

Chemical Reactions

Electron Transfer in Chemical Reactions

What If There Were No Intermolecular Forces - the Ideal Gas

Solutions

When Reactants Turn Into Products

Chemical Equilibrium

Electrolytes, Acids, and Bases

Nuclear Chemistry

The Chemistry of Carbon

Synthetic and Biological Polymers

Filters

The element in C₇H₅NO₃ whose % composition is 31.8% is ________.

A lead-sulfur compound contains 86.6% Pb. Its empirical formula is PbS₂.

The molar mass of a compound AL₂(XO₄)₃ is 342. The atomic mass of X is , which is .

Match each compound with its corresponding percent of oxygen. -C?H₈N?O?S

The maximum number of moles of carbon dioxide that can be produced from four moles of C₃H₈O is ________. 2 C₃H₈O + 9 O₂ → 6 CO₂ + 8 H₂O

Match each compound with its corresponding percent of carbon. -C?H₈N?O?S