Question 1

Match each compound with its corresponding number of atoms per formula unit.
-(NH?)3PO?

Accepted Answer

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

Question 2

If 36 g of water are produced from two moles of C₃H8O, the percent yield of the reaction is ________. 2 C₃H8O + 9 O₂ → 6 CO₂ + 8 H₂O

Accepted Answer

A)  100% 
B)  50% 
C)  25% 
D)  10% 
A)  100% 
B)  50% 
C)  25% 
D)  10%

Question 3

Match each compound with its corresponding percent of carbon.
-C?H8ClN

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 4

Methanol (CH₄O) weighs 32 g/mol. What is the mass percentage of carbon in methanol?

Accepted Answer

A)  63% 
B)  50% 
C)  20% 
D)  38% 
A)  63% 
B)  50% 
C)  20% 
D)  38%

Question 5

12 g of carbon 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 6

Which of the following compounds has its combined carbon and hydrogen composition equal to 37.0%?

Accepted Answer

A)  C₄H₇Cl 
B)  CH₂O₂ 
C)  C₂H₃NO₂ 
D)  C₁₀H₂₀ONS 
A)  C₄H₇Cl 
B)  CH₂O₂ 
C)  C₂H₃NO₂ 
D)  C₁₀H₂₀ONS

Question 7

Hydrazine contains 87.5% nitrogen and 12.5% hydrogen. If the molecular mass is 32 ± 6, the molecular formula is ________.

Accepted Answer

A)  N₂H 
B)  N₂H₂ 
C)  N₂H₃ 
D)  N₂H₄ 
A)  N₂H 
B)  N₂H₂ 
C)  N₂H₃ 
D)  N₂H₄

Question 8

What is the percent yield for a given process, if 4.0 kg of a product is recovered from a reaction whose theoretical yield is 5.6 kg?

Accepted Answer

A)  41% 
B)  62% 
C)  71% 
D)  89% 
A)  41% 
B)  62% 
C)  71% 
D)  89%

Question 9

The theoretical number of moles of sodium produced from 4 moles of NaN3 is ________. NaN3 → Na + N₂

Accepted Answer

A)  1 
B)  2 
C)  4 
D)  8 
A)  1 
B)  2 
C)  4 
D)  8

Question 10

A sample of oxygen gas that contains Avogadro's number of atoms has a mass of ________.

Accepted Answer

A)  8.0 g 
B)  16.0 g 
C)  32.0 g 
D)  64.0 g 
A)  8.0 g 
B)  16.0 g 
C)  32.0 g 
D)  64.0 g

Question 11

If 4 moles of nitrogen produces 2 moles of nitrogen dioxide, then the percent yield is ________. N₂ + 2 O₂ → 2 NO₂

Accepted Answer

A)  100% 
B)  50% 
C)  25% 
D)  12.5% 
A)  100% 
B)  50% 
C)  25% 
D)  12.5%

Question 12

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. How many grams of the excess reactant are left over. 2 C₄H₁₀ + 13 O₂ → 8 CO₂ + 10 H₂O

Accepted Answer

A)  15.7 g 
B)  21.8 g 
C)  28.0 g 
D)  40.6 g 
E)  45.8 g 
A)  15.7 g 
B)  21.8 g 
C)  28.0 g 
D)  40.6 g 
E)  45.8 g

Question 13

Which of the following contains the greatest number of atoms?

Accepted Answer

A)  1.0 mole C₆H14 
B)  3.0 moles N₂O5 
C)  12.0 moles silver 
D)  3.0 moles water 
A)  1.0 mole C₆H14 
B)  3.0 moles N₂O5 
C)  12.0 moles silver 
D)  3.0 moles water

Question 14

An independent experiment showed that the molecular weight of isopropyl alcohol is approximately 62. The molecular formula therefore is ________.

Accepted Answer

A)  C₂H₆O₂ 
B)  C₃H8O₂ 
C)  C₃H8O 
D)  C₃H₁₀O₂ 
A)  C₂H₆O₂ 
B)  C₃H8O₂ 
C)  C₃H8O 
D)  C₃H₁₀O₂

Question 15

The percent composition of chlorine in C₆H8NCl is 23.4%.

Accepted Answer

A) True 
 B)False

Question 16

Match each compound with its corresponding percent of sulfur.
-Na?S2O?

Accepted Answer

A) 8.7% 
B) 22.6% 
C) 41.1% 
D) 40.6% 
A) 8.7% 
B) 22.6% 
C) 41.1% 
D) 40.6%

Question 17

Which reactant is the limiting reagent if 6 mol of H₂ and 4 mol of O₂ are used? 2H₂ + O₂ → 2H₂O

Accepted Answer

A)  O₂ 
B)  H₂ 
C)  neither H₂ nor O₂ 
D)  both H₂ and O₂ 
A)  O₂ 
B)  H₂ 
C)  neither H₂ nor O₂ 
D)  both H₂ and O₂

Question 18

0.540 g of bromine combine with 0.858 g of iodine to yield a compound X. Its percent composition is ________.

Accepted Answer

A)  Br = 38.6%, I = 61.4% 
B)  Br = 61.3%, I = 38.6% 
C)  Br = 32.8%, I = 67.2% 
D)  Br = 67.2%, I = 32.8% 
A)  Br = 38.6%, I = 61.4% 
B)  Br = 61.3%, I = 38.6% 
C)  Br = 32.8%, I = 67.2% 
D)  Br = 67.2%, I = 32.8%

Question 19

What is the theoretical mass of carbon dioxide produced from 4.0 moles of NaHCO₃? NaHCO₃ → Na₂CO₃ + CO₂ + H₂O

Accepted Answer

A)  1.0 g 
B)  22 g 
C)  44 g 
D)  88 g 
A)  1.0 g 
B)  22 g 
C)  44 g 
D)  88 g

Question 20

Ilmenite (FeTiO₃) is the primary ore from which the element titanium (Ti) is isolated. What is the percentage of titanium by mass in this mineral?

Accepted Answer

A)  20% 
B)  32% 
C)  80% 
D)  68% 
A)  20% 
B)  32% 
C)  80% 
D)  68%

Match each compound with its corresponding number of atoms per formula unit. -(NH?)3PO?

If 36 g of water are produced from two moles of C₃H₈O, the percent yield of the reaction is ________. 2 C₃H₈O + 9 O₂ → 6 CO₂ + 8 H₂O

Match each compound with its corresponding percent of carbon. -C?H₈ClN

Methanol (CH₄O) weighs 32 g/mol. What is the mass percentage of carbon in methanol?

12 g of carbon is equal to ________.

Which of the following compounds has its combined carbon and hydrogen composition equal to 37.0%?

Hydrazine contains 87.5% nitrogen and 12.5% hydrogen. If the molecular mass is 32 ± 6, the molecular formula is ________.

What is the percent yield for a given process, if 4.0 kg of a product is recovered from a reaction whose theoretical yield is 5.6 kg?

The theoretical number of moles of sodium produced from 4 moles of NaN₃ is ________. NaN₃ → Na + N₂

A sample of oxygen gas that contains Avogadro's number of atoms has a mass of ________.

If 4 moles of nitrogen produces 2 moles of nitrogen dioxide, then the percent yield is ________. N₂ + 2 O₂ → 2 NO₂

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. How many grams of the excess reactant are left over. 2 C₄H₁₀ + 13 O₂ → 8 CO₂ + 10 H₂O

Which of the following contains the greatest number of atoms?

An independent experiment showed that the molecular weight of isopropyl alcohol is approximately 62. The molecular formula therefore is ________.

The percent composition of chlorine in C₆H₈NCl is 23.4%.

Match each compound with its corresponding percent of sulfur. -Na?S₂O?

Which reactant is the limiting reagent if 6 mol of H₂ and 4 mol of O₂ are used? 2H₂ + O₂ → 2H₂O

0.540 g of bromine combine with 0.858 g of iodine to yield a compound X. Its percent composition is ________.

What is the theoretical mass of carbon dioxide produced from 4.0 moles of NaHCO₃? NaHCO₃ → Na₂CO₃ + CO₂ + H₂O

Ilmenite (FeTiO₃) is the primary ore from which the element titanium (Ti) is isolated. What is the percentage of titanium by mass in this mineral?

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. -(NH?)3PO?

If 36 g of water are produced from two moles of C₃H8O, the percent yield of the reaction is ________. 2 C₃H8O + 9 O₂ → 6 CO₂ + 8 H₂O

Match each compound with its corresponding percent of carbon. -C?H8ClN

Methanol (CH₄O) weighs 32 g/mol. What is the mass percentage of carbon in methanol?

12 g of carbon is equal to ________.

Which of the following compounds has its combined carbon and hydrogen composition equal to 37.0%?

Hydrazine contains 87.5% nitrogen and 12.5% hydrogen. If the molecular mass is 32 ± 6, the molecular formula is ________.

What is the percent yield for a given process, if 4.0 kg of a product is recovered from a reaction whose theoretical yield is 5.6 kg?

The theoretical number of moles of sodium produced from 4 moles of NaN3 is ________. NaN3 → Na + N₂

A sample of oxygen gas that contains Avogadro's number of atoms has a mass of ________.

If 4 moles of nitrogen produces 2 moles of nitrogen dioxide, then the percent yield is ________. N₂ + 2 O₂ → 2 NO₂

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. How many grams of the excess reactant are left over. 2 C₄H₁₀ + 13 O₂ → 8 CO₂ + 10 H₂O

Which of the following contains the greatest number of atoms?

An independent experiment showed that the molecular weight of isopropyl alcohol is approximately 62. The molecular formula therefore is ________.

The percent composition of chlorine in C₆H8NCl is 23.4%.

Match each compound with its corresponding percent of sulfur. -Na?S2O?

Which reactant is the limiting reagent if 6 mol of H₂ and 4 mol of O₂ are used? 2H₂ + O₂ → 2H₂O

0.540 g of bromine combine with 0.858 g of iodine to yield a compound X. Its percent composition is ________.

What is the theoretical mass of carbon dioxide produced from 4.0 moles of NaHCO₃? NaHCO₃ → Na₂CO₃ + CO₂ + H₂O

Ilmenite (FeTiO₃) is the primary ore from which the element titanium (Ti) is isolated. What is the percentage of titanium by mass in this mineral?

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

If 36 g of water are produced from two moles of C₃H₈O, the percent yield of the reaction is ________. 2 C₃H₈O + 9 O₂ → 6 CO₂ + 8 H₂O

Match each compound with its corresponding percent of carbon. -C?H₈ClN

The theoretical number of moles of sodium produced from 4 moles of NaN₃ is ________. NaN₃ → Na + N₂

The percent composition of chlorine in C₆H₈NCl is 23.4%.

Match each compound with its corresponding percent of sulfur. -Na?S₂O?