Question 1

Which of the following substances contains the greatest mass of carbon?

Accepted Answer

A) 100 g CH4 
B) 100 g C2H4 
C) 100 g CCl4 
D) 100 g CH2Cl2 
E) 100 g CO2

Question 2

Which of the following is the empirical formula for hexane, C6H14?

Accepted Answer

A) C12H28 
B) C6H14 
C) C3H7 
D) CH2.3 
E) C0.43H

Question 3

What is the mass of 0.0250 mol of P2O5?

Accepted Answer

A) 35.5 g 
B) 5676 g 
C) 0.0250 g 
D) 1.51 × 1022 g 
E) 3.55 g

Question 4

What is the mass in grams of 0.250 mol of the common antacid calcium carbonate?

Accepted Answer

A) 4.0 × 102 g 
B) 25.0 g 
C) 17.0 g 
D) 4.00 × 10−2 g 
E) 2.50 × 10−3 g

Question 5

Aluminum sulfate, Al2(SO4)3, is used in tanning leather, purifying water, and the manufacture of antiperspirants.Calculate its molecular or formula mass.

Accepted Answer

A) 450.06 amu 
B) 342.17 amu 
C) 315.15 amu 
D) 278.02 amu 
E) 74.98 amu

Question 6

Which of the following is a molecular formula for a compound with an empirical formula of CH2O and a molar mass of 150.g/mol?

Accepted Answer

A) C7H18O3 
B) C5H10O5 
C) C3H6O3 
D) CH2O 
E) None of the answers is correct.

Question 7

How many atoms are in 7.12 mol of gold, Au?

Accepted Answer

A) 1.18 × 10−23 atoms 
B) 4.29 × 1024 atoms 
C) 8.46 × 1022 atoms 
D) 4.70 × 1024 atoms 
E) 3.34 × 1026 atoms

Question 8

Sulfur trioxide can react with atmospheric water vapor to form sulfuric acid that falls as acid rain.Calculate the mass in grams of 3.65 × 1020 molecules of sulfur trioxide.

Accepted Answer

A) 6.06 × 10−4 g 
B) 2.91 × 10−2 g 
C) 4.85 × 10−2 g 
D) 20.6 g 
E) 1650 g

Question 9

Phosphorus pentachloride, a white solid that has a pungent, unpleasant odor, is used as a catalyst for certain organic reactions.Calculate the number of moles in 38.7 g of phosphorus pentachloride.

Accepted Answer

A) 5.38 mol 
B) 3.55 mol 
C) 0.583 mol 
D) 0.282 mol 
E) 0.186 mol

Question 10

How many moles are present in 17.4 g of lead?

Accepted Answer

A) 0.0994 moles 
B) 1.05 × 1025 moles 
C) 0.0840 moles 
D) 10.06 moles 
E) 11.9 moles

Question 11

What is the mass of 7.80 × 1018 carbon atoms? (NA = 6.022 × 1023 mol−1)

Accepted Answer

A) 1.30 × 10−5 g 
B) 6.43 × 103 g 
C) 7.80 × 1018 g 
D) 1.56 × 10−4 g 
E) 12.01 g

Question 12

Determine the mass of hydrogen (in grams) that contains 5.08 × 1015 hydrogen atoms.

Accepted Answer

A) 5.12 × 1015 g 
B) 3.06 × 1039 g 
C) 3.06 × 10−9 g 
D) 8.50 × 10−9 g 
E) 8.5 × 1015 g

Question 13

Household sugar, sucrose, has the molecular formula C12H22O11.What is the % of carbon in sucrose, by mass?

Accepted Answer

A) 26.7% 
B) 33.3% 
C) 41.4% 
D) 42.1% 
E) 51.4%

Question 14

Determine the mass of Sr(C2H3O2)2 that contains 2.780 Χ 1023 atoms of carbon.

Accepted Answer

A) 205.7 g 
B) 57.19 g 
C) 46.16 g 
D) 94.96 g 
E) 23.74 g

Question 15

Calculate the mass of 3.00 moles of CF2Cl2.

Accepted Answer

A) 3.00 g 
B) 174 g 
C) 363 g 
D) 1.81 × 1024 g 
E) 40.3

Question 16

Calculate the formula mass of (NH4)3AsO4.

Accepted Answer

A) 417.80 amu 
B) 193.05 amu 
C) 165.02 amu 
D) 156.96 amu 
E) 108.96 amu

Question 17

What is the mass percent of oxygen in barium perchlorate?

Accepted Answer

A) 4.7% 
B) 8.5% 
C) 23.4% 
D) 38.1% 
E) 19.0%

Question 18

What is the percent sodium in sodium carbonate?

Accepted Answer

A) 43.4% 
B) 11.3% 
C) 45.3% 
D) 27.7% 
E) 21.7%

Question 19

Smooth muscle myosin is a motor protein that plays a crucial role in the contraction of smooth muscle.If this protein has a molar mass of 480,000 grams/mol, what is the mass, in grams, of 27 moles of smooth muscle myosin?

Accepted Answer

A) 1.8 × 104 g 
B) 1.3 × 107 g 
C) 1.8 × 102 g 
D) 2.8 × 1029 g 
E) None of the answers is correct.

Question 20

Determine the empirical formula of a compound that contains 1.409 moles of P and 3.52 moles of O in a particular sample.

Accepted Answer

A) PO2 
B) PO3 
C) P2O6 
D) P2O5 
E) P2O3

Exam 5: The Mole and Chemical Formulas

Which of the following substances contains the greatest mass of carbon?

Which of the following is the empirical formula for hexane, C₆H₁₄?

What is the mass of 0.0250 mol of P₂O₅?

What is the mass in grams of 0.250 mol of the common antacid calcium carbonate?

Aluminum sulfate, Al₂(SO₄) ₃, is used in tanning leather, purifying water, and the manufacture of antiperspirants.Calculate its molecular or formula mass.

Which of the following is a molecular formula for a compound with an empirical formula of CH₂O and a molar mass of 150.g/mol?

How many atoms are in 7.12 mol of gold, Au?

Sulfur trioxide can react with atmospheric water vapor to form sulfuric acid that falls as acid rain.Calculate the mass in grams of 3.65 × 10²⁰ molecules of sulfur trioxide.

Phosphorus pentachloride, a white solid that has a pungent, unpleasant odor, is used as a catalyst for certain organic reactions.Calculate the number of moles in 38.7 g of phosphorus pentachloride.

How many moles are present in 17.4 g of lead?

What is the mass of 7.80 × 10¹⁸ carbon atoms? (N_A = 6.022 × 10²³ mol⁻¹)

Determine the mass of hydrogen (in grams) that contains 5.08 × 10¹⁵ hydrogen atoms.

Household sugar, sucrose, has the molecular formula C₁₂H₂₂O₁₁.What is the % of carbon in sucrose, by mass?

Determine the mass of Sr(C₂H₃O₂) ₂ that contains 2.780 Χ 10²³ atoms of carbon.

Calculate the mass of 3.00 moles of CF₂Cl₂.

Calculate the formula mass of (NH₄) ₃AsO₄.

What is the mass percent of oxygen in barium perchlorate?

What is the percent sodium in sodium carbonate?

Smooth muscle myosin is a motor protein that plays a crucial role in the contraction of smooth muscle.If this protein has a molar mass of 480,000 grams/mol, what is the mass, in grams, of 27 moles of smooth muscle myosin?

Determine the empirical formula of a compound that contains 1.409 moles of P and 3.52 moles of O in a particular sample.

Exam 5: The Mole and Chemical Formulas

Which of the following substances contains the greatest mass of carbon?

Which of the following is the empirical formula for hexane, C6H14?

What is the mass of 0.0250 mol of P2O5?

What is the mass in grams of 0.250 mol of the common antacid calcium carbonate?

Aluminum sulfate, Al2(SO4) 3, is used in tanning leather, purifying water, and the manufacture of antiperspirants.Calculate its molecular or formula mass.

Which of the following is a molecular formula for a compound with an empirical formula of CH2O and a molar mass of 150.g/mol?

How many atoms are in 7.12 mol of gold, Au?

Sulfur trioxide can react with atmospheric water vapor to form sulfuric acid that falls as acid rain.Calculate the mass in grams of 3.65 × 1020 molecules of sulfur trioxide.

Phosphorus pentachloride, a white solid that has a pungent, unpleasant odor, is used as a catalyst for certain organic reactions.Calculate the number of moles in 38.7 g of phosphorus pentachloride.

How many moles are present in 17.4 g of lead?

What is the mass of 7.80 × 1018 carbon atoms? (NA = 6.022 × 1023 mol−1)

Determine the mass of hydrogen (in grams) that contains 5.08 × 1015 hydrogen atoms.

Household sugar, sucrose, has the molecular formula C12H22O11.What is the % of carbon in sucrose, by mass?

Determine the mass of Sr(C2H3O2) 2 that contains 2.780 Χ 1023 atoms of carbon.

Calculate the mass of 3.00 moles of CF2Cl2.

Calculate the formula mass of (NH4) 3AsO4.

What is the mass percent of oxygen in barium perchlorate?

What is the percent sodium in sodium carbonate?

Smooth muscle myosin is a motor protein that plays a crucial role in the contraction of smooth muscle.If this protein has a molar mass of 480,000 grams/mol, what is the mass, in grams, of 27 moles of smooth muscle myosin?

Determine the empirical formula of a compound that contains 1.409 moles of P and 3.52 moles of O in a particular sample.

Which of the following is the empirical formula for hexane, C₆H₁₄?

What is the mass of 0.0250 mol of P₂O₅?

Aluminum sulfate, Al₂(SO₄) ₃, is used in tanning leather, purifying water, and the manufacture of antiperspirants.Calculate its molecular or formula mass.

Which of the following is a molecular formula for a compound with an empirical formula of CH₂O and a molar mass of 150.g/mol?

Sulfur trioxide can react with atmospheric water vapor to form sulfuric acid that falls as acid rain.Calculate the mass in grams of 3.65 × 10²⁰ molecules of sulfur trioxide.

What is the mass of 7.80 × 10¹⁸ carbon atoms? (N_A = 6.022 × 10²³ mol⁻¹)

Determine the mass of hydrogen (in grams) that contains 5.08 × 10¹⁵ hydrogen atoms.

Household sugar, sucrose, has the molecular formula C₁₂H₂₂O₁₁.What is the % of carbon in sucrose, by mass?

Determine the mass of Sr(C₂H₃O₂) ₂ that contains 2.780 Χ 10²³ atoms of carbon.

Calculate the mass of 3.00 moles of CF₂Cl₂.

Calculate the formula mass of (NH₄) ₃AsO₄.