Question 1

How many grams are contained in a 0.893 mol sample of methane,CH4?

Accepted Answer

A)  1.48 × 10-24 g
B)  5.38 × 1023 g
C)  8.64 × 1024 g
D)  14.3 g
E)  18.0 gF) B) and E)
G) None of the above

Question 2

Calculate the number of moles in 17.8 g of the antacid magnesium hydroxide,Mg(OH) 2.

Accepted Answer

A)  3.28 mol
B)  2.32 mol
C)  0.431 mol
D)  0.305 mol
E)  0.200 molF) B) and C)
G) None of the above

Question 3

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.F) A) and C)
G) A) and B)

Question 4

What is the coefficient preceding O2 when the following combustion reaction of a fatty acid is properly balanced using the smallest set of whole numbers? __ C18H36O2 + __ O2 → __ CO2 + __ H2O

Accepted Answer

A)  1
B)  8
C)  9
D)  26
E)  27F) A) and D)
G) C) and D)

Question 5

Balance the following equation for the combustion of benzene: C6H6(l) + O2(g) → H2O(g) + CO2(g)

Accepted Answer

A)  C6H6(l) + 9O2(g) → 3H2O(g) + 6CO2(g) 
B)  C6H6(l) + 9O2(g) → 6H2O(g) + 6CO2(g) 
C)  2C6H6(l) + 15O2(g) → 6H2O(g) + 12CO2(g) 
D)  C6H6(l) + 15O2(g) → 3H2O(g) + 6CO2(g) 
E)  2C6H6(l) + 9O2(g) → 6H2O(g) + 12CO2(g) F) A) and B)
G) B) and C)

Question 6

Balance the following equation: B2O3(s) + HF(l) → BF3(g) + H2O(l)

Accepted Answer

A)  B2O3(s) + 6HF(l) → 2BF3(g) + 3H2O(l) 
B)  B2O3(s) + H6F6 (l) → B2F6(g) + H6O3(l) 
C)  B2O3(s) + 2HF(l) → 2BF3(g) + H2O(l) 
D)  B2O3(s) + 3HF(l) → 2BF3(g) + 3H2O(l) 
E)  B2O3(s) + 6HF(l) → 2BF3(g) + 6H2O(l) F) A) and B)
G) A) and C)

Question 7

The percent yield can be determined by dividing the actual yield by the theoretical yield and multiplying this value by 100%.

Accepted Answer

A) True 
 B)False

Question 8

How many grams of lead(II) chloride is produced if 13.87 g lead(II) nitrate combines with excess hydrochloric acid to produce lead(II) chloride and nitric acid?

Accepted Answer

A)  5.82 g
B)  14.33 g
C)  0.086 g
D)  11.64 g
E)  16.52 gF) C) and D)
G) All of the above

Question 9

Calculate the formula mass of potassium permanganate,KMnO4.

Accepted Answer

A)  149.91 amu
B)  79.41 amu
C)  127.41 amu
D)  158.04 amu
E)  174.04 amuF) A) and B)
G) A) and C)

Question 10

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%F) A) and E)
G) B) and C)

Question 11

What is the theoretical yield of chromium that can be produced by the reaction of 40.0 g of Cr2O3 with 8.00 g of aluminum according to the chemical equation below? 2Al + Cr2O3 → Al2O3 + 2Cr

Accepted Answer

A)  7.7 g
B)  15.4 g
C)  27.4 g
D)  30.8 g
E)  49.9 gF) C) and E)
G) A) and C)

Exam 3: Stoichiometry Ratios of Combination

The percent yield can be determined by dividing the actual yield by the theoretical yield and multiplying this value by 100%.

Correct Answer
verified

What is the theoretical yield of chromium that can be produced by the reaction of 40.0 g of Cr₂O₃ with 8.00 g of aluminum according to the chemical equation below? 2Al + Cr₂O₃ → Al₂O₃ + 2Cr

Correct Answer
verified

How many grams are contained in a 0.893 mol sample of methane,CH₄?

Correct Answer
verified

Balance the following equation: B₂O₃(s) + HF(l) → BF₃(g) + H₂O(l)

Correct Answer
verified

Balance the following equation for the combustion of benzene: C₆H₆(l) + O₂(g) → H₂O(g) + CO₂(g)

Correct Answer
verified

Calculate the number of moles in 17.8 g of the antacid magnesium hydroxide,Mg(OH) ₂.

Correct Answer
verified

What is the coefficient preceding O₂ when the following combustion reaction of a fatty acid is properly balanced using the smallest set of whole numbers? C₁₈H₃₆O₂ + O₂ → CO₂ + H₂O

Correct Answer
verified

Calculate the formula mass of potassium permanganate,KMnO₄.

Correct Answer
verified

How many grams of lead(II) chloride is produced if 13.87 g lead(II) nitrate combines with excess hydrochloric acid to produce lead(II) chloride and nitric acid?

Correct Answer
verified

What is the percent sodium in sodium carbonate?

Correct Answer
verified

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?

Correct Answer
verified

Exam 3: Stoichiometry Ratios of Combination

The percent yield can be determined by dividing the actual yield by the theoretical yield and multiplying this value by 100%.

Correct AnswerverifiedShow Answer

What is the theoretical yield of chromium that can be produced by the reaction of 40.0 g of Cr2O3 with 8.00 g of aluminum according to the chemical equation below? 2Al + Cr2O3 → Al2O3 + 2Cr

Correct AnswerverifiedShow Answer

How many grams are contained in a 0.893 mol sample of methane,CH4?

Correct AnswerverifiedShow Answer

Balance the following equation: B2O3(s) + HF(l) → BF3(g) + H2O(l)

Correct AnswerverifiedShow Answer

Balance the following equation for the combustion of benzene: C6H6(l) + O2(g) → H2O(g) + CO2(g)

Correct AnswerverifiedShow Answer

Calculate the number of moles in 17.8 g of the antacid magnesium hydroxide,Mg(OH) 2.

Correct AnswerverifiedShow Answer

What is the coefficient preceding O2 when the following combustion reaction of a fatty acid is properly balanced using the smallest set of whole numbers? __ C18H36O2 + __ O2 → __ CO2 + __ H2O

Correct AnswerverifiedShow Answer

Calculate the formula mass of potassium permanganate,KMnO4.

Correct AnswerverifiedShow Answer

How many grams of lead(II) chloride is produced if 13.87 g lead(II) nitrate combines with excess hydrochloric acid to produce lead(II) chloride and nitric acid?

Correct AnswerverifiedShow Answer

What is the percent sodium in sodium carbonate?

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

Correct Answer
verified

What is the theoretical yield of chromium that can be produced by the reaction of 40.0 g of Cr₂O₃ with 8.00 g of aluminum according to the chemical equation below? 2Al + Cr₂O₃ → Al₂O₃ + 2Cr

Correct Answer
verified

How many grams are contained in a 0.893 mol sample of methane,CH₄?

Correct Answer
verified

Balance the following equation: B₂O₃(s) + HF(l) → BF₃(g) + H₂O(l)

Correct Answer
verified

Balance the following equation for the combustion of benzene: C₆H₆(l) + O₂(g) → H₂O(g) + CO₂(g)

Correct Answer
verified

Calculate the number of moles in 17.8 g of the antacid magnesium hydroxide,Mg(OH) ₂.

Correct Answer
verified

What is the coefficient preceding O₂ when the following combustion reaction of a fatty acid is properly balanced using the smallest set of whole numbers? C₁₈H₃₆O₂ + O₂ → CO₂ + H₂O

Correct Answer
verified

Calculate the formula mass of potassium permanganate,KMnO₄.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified