Question 1

Match each compound with its corresponding number of atoms per formula unit.
-Ca3(PO?)2

Accepted Answer

A) 19 
B) 23 
C) 22 
D) 13 
E) 17 
A) 19 
B) 23 
C) 22 
D) 13 
E) 17 D

Question 2

A chromium-silicon compound contains 73.52% chromium. The empirical formula is ________.

Accepted Answer

A)  CrSi 
B)  CrSI₂ 
C)  Cr₂Si 
D)  Cr3SI₂ 
A)  CrSi 
B)  CrSI₂ 
C)  Cr₂Si 
D)  Cr3SI₂ D

Question 3

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

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% E

Question 4

The number of oxygen atoms present in 32.4 g of N₂O5 is ________.

Accepted Answer

A)  5.00 
B)  9.03 × 1023 
C)  4.51 × 1023 
D)  1.81 × 1023 
A)  5.00 
B)  9.03 × 1023 
C)  4.51 × 1023 
D)  1.81 × 1023

Question 5

Which of the following percentage compositions does not correspond to one of the elements of C₆H₁₂O6?

Accepted Answer

A)  43.4% 
B)  40.0% 
C)  6.7% 
D)  53.3% 
A)  43.4% 
B)  40.0% 
C)  6.7% 
D)  53.3%

Question 6

Determine the molecular formula for a compound that has a molar mass of 135 g/mol and is 44.4% C, 51.9% N, and 3.7% H by mass.

Accepted Answer

The answer of Determine the molecular formula for a compound...

Question 7

There are more atoms in 20 g Na3PO₄ than in 20 g HCl.

Accepted Answer

A) True 
 B)False

Question 8

A compound is found to be 43.7% phosphorus and 56.3% oxygen. Given the molecular mass as 285 ± 10, calculate the empirical and molecular formulas.

Accepted Answer

A)  PO₂; P4O8 
B)  P2O5; P4O10 
C)  P₂O₃; P6O9 
D)  P4O10; P4O10 
A)  PO₂; P4O8 
B)  P2O5; P4O10 
C)  P₂O₃; P6O9 
D)  P4O10; P4O10

Question 9

The maximum number of moles of water that can be produced from 0.5 moles of C₃H8O is ________. 2 C₃H8O + 9 O₂ → 6 CO₂ + 8 H₂O

Accepted Answer

A)  0.5 
B)  2 
C)  4 
D)  8 
A)  0.5 
B)  2 
C)  4 
D)  8

Question 10

The % yield of an experiment in which 1.0 mole of C₆H14 was used and 22 g of carbon dioxide was isolated is ________. C₆H14 + O₂ → CO₂ + H₂O

Accepted Answer

A)  100% 
B)  50% 
C)  17.5% 
D)  8.3% 
A)  100% 
B)  50% 
C)  17.5% 
D)  8.3%

Question 11

Determine the molecular formula for a compound that weighs 44.1 g/mol and is 81.7% C and 18.3% H by mass.

Accepted Answer

C₃H₈. From an origina

Question 12

Which reagent will be used up first if 78.1 g of O₂ is reacted with 62.4 g of C₄H₁₀? 2 C₄H₁₀ + 13 O₂ → 8 CO₂ + 10 H₂O

Accepted Answer

A)  C₄H₁₀, butane 
B)  oxygen 
C)  water 
D)  carbon dioxide 
A)  C₄H₁₀, butane 
B)  oxygen 
C)  water 
D)  carbon dioxide

Question 13

The percent composition of sulfur is approximately equal to the percent composition of oxygen in sulfur dioxide, SO₂.

Accepted Answer

A) True 
 B)False

Question 14

Determine the molecular formula for a compound that has a molar mass of 157.01 g/mol and is 45.9% C, 50.9% Br, and 3.21% H by mass.

Accepted Answer

The answer of Determine the molecular formula for a compound...

Question 15

Which of the following percentage compositions does not correspond to one of the elements of C9H8O₄?

Accepted Answer

A)  4% 
B)  26% 
C)  36% 
D)  60% 
A)  4% 
B)  26% 
C)  36% 
D)  60%

Question 16

Which contains the least percentage of oxygen?

Accepted Answer

A)  H₂O₂ 
B)  Na₂O₂ 
C)  HgO 
D)  CO₂ 
A)  H₂O₂ 
B)  Na₂O₂ 
C)  HgO 
D)  CO₂

Question 17

The maximum amount of IF7 that can be obtained from 25.0 g is fluorine is ________. I₂ + F₂ → IF7

Accepted Answer

A)  63 g 
B)  48.9 g 
C)  24.5 g 
D)  12.3 g 
A)  63 g 
B)  48.9 g 
C)  24.5 g 
D)  12.3 g

Question 18

A selenium-chlorine compound is 35.7% in selenium. Its empirical formula is ________.

Accepted Answer

A)  SeCl 
B)  SeCL₂ 
C)  SeCL₃ 
D)  SeCl4 
A)  SeCl 
B)  SeCL₂ 
C)  SeCL₃ 
D)  SeCl4

Question 19

The mass of one formula unit of AL₂(SO₄)3 is ________ g.

Accepted Answer

A)  342 
B)  0.0029 
C)  5.7 × 10-22 
D)  8.0 × 10-27 
A)  342 
B)  0.0029 
C)  5.7 × 10-22 
D)  8.0 × 10-27

Question 20

What is the percentage by mass of hydrogen in ordinary water (H₂O)?

Accepted Answer

A)  20% 
B)  11% 
C)  60% 
D)  40% 
A)  20% 
B)  11% 
C)  60% 
D)  40%

Match each compound with its corresponding number of atoms per formula unit. -Ca₃(PO?)₂

A chromium-silicon compound contains 73.52% chromium. The empirical formula is ________.

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

The number of oxygen atoms present in 32.4 g of N₂O₅ is ________.

Which of the following percentage compositions does not correspond to one of the elements of C₆H₁₂O₆?

Determine the molecular formula for a compound that has a molar mass of 135 g/mol and is 44.4% C, 51.9% N, and 3.7% H by mass.

There are more atoms in 20 g Na₃PO₄ than in 20 g HCl.

A compound is found to be 43.7% phosphorus and 56.3% oxygen. Given the molecular mass as 285 ± 10, calculate the empirical and molecular formulas.

The maximum number of moles of water that can be produced from 0.5 moles of C₃H₈O is ________. 2 C₃H₈O + 9 O₂ → 6 CO₂ + 8 H₂O

The % yield of an experiment in which 1.0 mole of C₆H14 was used and 22 g of carbon dioxide was isolated is ________. C₆H₁₄ + O₂ → CO₂ + H₂O

Determine the molecular formula for a compound that weighs 44.1 g/mol and is 81.7% C and 18.3% H by mass.

Which reagent will be used up first if 78.1 g of O₂ is reacted with 62.4 g of C₄H₁₀? 2 C₄H₁₀ + 13 O₂ → 8 CO₂ + 10 H₂O

The percent composition of sulfur is approximately equal to the percent composition of oxygen in sulfur dioxide, SO₂.

Determine the molecular formula for a compound that has a molar mass of 157.01 g/mol and is 45.9% C, 50.9% Br, and 3.21% H by mass.

Which of the following percentage compositions does not correspond to one of the elements of C₉H₈O₄?

Which contains the least percentage of oxygen?

The maximum amount of IF7 that can be obtained from 25.0 g is fluorine is ________. I₂ + F₂ → IF7

A selenium-chlorine compound is 35.7% in selenium. Its empirical formula is ________.

The mass of one formula unit of AL₂(SO₄)₃ is ________ g.

What is the percentage by mass of hydrogen in ordinary water (H₂O)?

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

Match each compound with its corresponding number of atoms per formula unit. -Ca3(PO?)2

A chromium-silicon compound contains 73.52% chromium. The empirical formula is ________.

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

The number of oxygen atoms present in 32.4 g of N₂O5 is ________.

Which of the following percentage compositions does not correspond to one of the elements of C₆H₁₂O6?

Determine the molecular formula for a compound that has a molar mass of 135 g/mol and is 44.4% C, 51.9% N, and 3.7% H by mass.

There are more atoms in 20 g Na3PO₄ than in 20 g HCl.

A compound is found to be 43.7% phosphorus and 56.3% oxygen. Given the molecular mass as 285 ± 10, calculate the empirical and molecular formulas.

The maximum number of moles of water that can be produced from 0.5 moles of C₃H8O is ________. 2 C₃H8O + 9 O₂ → 6 CO₂ + 8 H₂O

The % yield of an experiment in which 1.0 mole of C₆H14 was used and 22 g of carbon dioxide was isolated is ________. C₆H14 + O₂ → CO₂ + H₂O

Determine the molecular formula for a compound that weighs 44.1 g/mol and is 81.7% C and 18.3% H by mass.

Which reagent will be used up first if 78.1 g of O₂ is reacted with 62.4 g of C₄H₁₀? 2 C₄H₁₀ + 13 O₂ → 8 CO₂ + 10 H₂O

The percent composition of sulfur is approximately equal to the percent composition of oxygen in sulfur dioxide, SO₂.

Determine the molecular formula for a compound that has a molar mass of 157.01 g/mol and is 45.9% C, 50.9% Br, and 3.21% H by mass.

Which of the following percentage compositions does not correspond to one of the elements of C9H8O₄?

Which contains the least percentage of oxygen?

The maximum amount of IF7 that can be obtained from 25.0 g is fluorine is ________. I₂ + F₂ → IF7

A selenium-chlorine compound is 35.7% in selenium. Its empirical formula is ________.

The mass of one formula unit of AL₂(SO₄)3 is ________ g.

What is the percentage by mass of hydrogen in ordinary water (H₂O)?

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

Match each compound with its corresponding number of atoms per formula unit. -Ca₃(PO?)₂

The number of oxygen atoms present in 32.4 g of N₂O₅ is ________.

Which of the following percentage compositions does not correspond to one of the elements of C₆H₁₂O₆?

There are more atoms in 20 g Na₃PO₄ than in 20 g HCl.

The maximum number of moles of water that can be produced from 0.5 moles of C₃H₈O is ________. 2 C₃H₈O + 9 O₂ → 6 CO₂ + 8 H₂O

The % yield of an experiment in which 1.0 mole of C₆H14 was used and 22 g of carbon dioxide was isolated is ________. C₆H₁₄ + O₂ → CO₂ + H₂O

Which of the following percentage compositions does not correspond to one of the elements of C₉H₈O₄?

The mass of one formula unit of AL₂(SO₄)₃ is ________ g.