Question 1

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 D)
G) A) and B)

Question 2

As a research assistant, you are asked to prepare a 3.00 liter solution of magnesium sulfate at 45.0 micromoles per liter. How many moles of magnesium sulfate are required to make this solution?

Accepted Answer

A)   0.000135 moles
B)   0.0000150 moles
C)   1.35 × 108 moles
D)   1.50 × 107 moles
E)   None of the answers is correct.F) C) and D)
G) B) and E)

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 gF) B) and D)
G) A) and B)

Question 4

The ________ is the amount of product that forms when all the limiting reactant reacts to form the desired product.

Accepted Answer

The answer of The ________ is the amount of product...

Question 5

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 gF) A) and B)
G) A) and C)

Question 6

Calculate the molecular mass of menthol, C10H20O.

Accepted Answer

A)   156 amu
B)   140 amu
C)   29 amu
D)   146 amu
E)   136 amuF) C) and D)
G) B) and E) A

Question 7

If 3.41 g of nitrogen react with 2.79 g of hydrogen to produce ammonia, what is the limiting reactant and what mass of ammonia is produced?

Accepted Answer

A)   Hydrogen is the limiting reactant and 0.22 g of ammonia are produced.
B)   Nitrogen is the limiting reactant and 2.07 g of ammonia are produced.
C)   Nitrogen is the limiting reactant and 4.15 g of ammonia are produced.
D)   Hydrogen is the limiting reactant and 23.5 g of ammonia are produced.
E)   Hydrogen is the limiting reactant and 15.8 g of ammonia are produced.F) B) and E)
G) All of the above C

Question 8

The ________ is the one component that is completely consumed during a chemical reaction.

Accepted Answer

The answer of The ________ is the one component that...

Question 9

Balance the following equation: C8H18O3(l)  + O2(g)  → H2O(g)  + CO2(g)

Accepted Answer

A)   C8H18O3(l)  + 8O2(g)  → 9H2O(g)  + 8CO2(g) 
B)   C8H18O3(l)  + 11O2(g)  → 9H2O(g)  + 8CO2(g) 
C)   2C8H18O3(l)  + 22O2(g)  → 9H2O(g)  + 16CO2(g) 
D)   C8H18O3(l)  + 13O2(g)  → 18H2O(g)  + 8CO2(g) 
E)   2C8H18O3(l)  + 17O2(g)  → 18H2O(g)  + 16CO2(g) F) C) and E)
G) All of the above

Question 10

The empirical formula of C6H6 is CH.

Accepted Answer

A) True 
 B)False

Question 11

How many moles of ammonia, NH3, are in 13.81 g of NH3?

Accepted Answer

A)   1.234 moles
B)   0.8107 moles
C)   8.316 × 1024 moles
D)   4.881 × 1023 moles
E)   235.3 molesF) None of the above
G) All of the above

Question 12

If 31.3 g of manganese(II)  chloride, 48.3 g of chlorine gas, and 25.7 g of water react to produce manganese(IV)  oxide and hydrochloric acid, what is the limiting reactant and what mass of hydrochloric acid is produced?

Accepted Answer

A)   Manganese(II)  chloride is the limiting reactant and 9.07 g of hydrochloric acid is produced.
B)   Chlorine is the limiting reactant and 99.3 g of hydrochloric acid is produced.
C)   Chlorine is the limiting reactant and 24.8 g of hydrochloric acid is produced.
D)   Manganese(II)  chloride is the limiting reactant and 36.3 g of hydrochloric acid is produced.
E)   Water is the limiting reactant and 52.0 g of hydrochloric acid is produced.F) A) and C)
G) C) and D)

Question 13

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)   40.3F) All of the above
G) B) and E)

Question 14

The ________ is defined by the following equation:
  × 100%

Accepted Answer

The answer of The ________ is defined by the following...

Question 15

How many grams are present in 0.885 moles of manganese?

Accepted Answer

A)   62.1 g
B)   48.6 g
C)   21.5 g
D)   27.5 g
E)   0.016 gF) B) and E)
G) None of the above

Question 16

The empirical formula is the simplest whole number ratio of atoms representing a chemical formula of a molecule.

Accepted Answer

A) True 
 B)False

Question 17

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) All of the above
G) B) and C)

Question 18

When a chemical equation is balanced, it will have a set of whole number coefficients that cannot be reduced to smaller whole numbers. What is the coefficient for O2 when the following combustion reaction of a hydrocarbon is balanced? ________ C7H14 + ________ O2 → ________ CO2 + ________ H2O

Accepted Answer

A)   42
B)   21
C)   11
D)   10
E)   None of these answers is correct.F) C) and D)
G) D) and E) B

Question 19

Once the following equation is balanced with the smallest set of whole number coefficients, what is the sum of the coefficients? (Don't forget to include coefficients of one.)  ________ SF4 + ________ H2O → ________ H2SO3 + ________ HF

Accepted Answer

A)   4
B)   6
C)   7
D)   9
E)   None of these answers is correct.F) D) and E)
G) A) and E)

Question 20

Once the following equation is balanced with the smallest set of whole number coefficients, what is the sum of the coefficients? (Don't forget to include coefficients of one.)  ________ CH4 + ________ Cl2 → ________ CCl4 + ________ HCl

Accepted Answer

A)   4
B)   6
C)   8
D)   10
E)   12F) B) and E)
G) B) and D)

Exam 3: Stoichiometry: Ratios of Combination

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

As a research assistant, you are asked to prepare a 3.00 liter solution of magnesium sulfate at 45.0 micromoles per liter. How many moles of magnesium sulfate are required to make this solution?

Correct AnswerverifiedShow Answer

What is the mass of 0.0250 mol of P2O5?

Correct AnswerverifiedShow Answer

The ________ is the amount of product that forms when all the limiting reactant reacts to form the desired product.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Calculate the molecular mass of menthol, C10H20O.

Correct AnswerverifiedA

If 3.41 g of nitrogen react with 2.79 g of hydrogen to produce ammonia, what is the limiting reactant and what mass of ammonia is produced?

Correct AnswerverifiedC

The ________ is the one component that is completely consumed during a chemical reaction.

Correct AnswerverifiedShow Answer

Balance the following equation: C8H18O3(l) + O2(g) → H2O(g) + CO2(g)

Correct AnswerverifiedShow Answer

The empirical formula of C6H6 is CH.

Correct AnswerverifiedShow Answer

How many moles of ammonia, NH3, are in 13.81 g of NH3?

Correct AnswerverifiedShow Answer

If 31.3 g of manganese(II) chloride, 48.3 g of chlorine gas, and 25.7 g of water react to produce manganese(IV) oxide and hydrochloric acid, what is the limiting reactant and what mass of hydrochloric acid is produced?

Correct AnswerverifiedShow Answer

Calculate the mass of 3.00 moles of CF2Cl2.

Correct AnswerverifiedShow Answer

The ________ is defined by the following equation: × 100%

Correct AnswerverifiedShow Answer

How many grams are present in 0.885 moles of manganese?

Correct AnswerverifiedShow Answer

The empirical formula is the simplest whole number ratio of atoms representing a chemical formula of a molecule.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

When a chemical equation is balanced, it will have a set of whole number coefficients that cannot be reduced to smaller whole numbers. What is the coefficient for O2 when the following combustion reaction of a hydrocarbon is balanced? ________ C7H14 + ________ O2 → ________ CO2 + ________ H2O

Correct AnswerverifiedB

Once the following equation is balanced with the smallest set of whole number coefficients, what is the sum of the coefficients? (Don't forget to include coefficients of one.) ________ SF4 + ________ H2O → ________ H2SO3 + ________ HF

Correct AnswerverifiedShow Answer

Once the following equation is balanced with the smallest set of whole number coefficients, what is the sum of the coefficients? (Don't forget to include coefficients of one.) ________ CH4 + ________ Cl2 → ________ CCl4 + ________ HCl

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 Answer
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What is the mass of 0.0250 mol of P₂O₅?

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

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Calculate the molecular mass of menthol, C₁₀H₂₀O.

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A

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C

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Balance the following equation: C₈H₁₈O₃(l) + O₂(g) → H₂O(g) + CO₂(g)

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The empirical formula of C₆H₆ is CH.

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How many moles of ammonia, NH₃, are in 13.81 g of NH₃?

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Calculate the mass of 3.00 moles of CF₂Cl₂.

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

Correct Answer
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When a chemical equation is balanced, it will have a set of whole number coefficients that cannot be reduced to smaller whole numbers. What is the coefficient for O₂ when the following combustion reaction of a hydrocarbon is balanced? C₇H₁₄ + O₂→ CO₂ + H₂O

Correct Answer
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B

Once the following equation is balanced with the smallest set of whole number coefficients, what is the sum of the coefficients? (Don't forget to include coefficients of one.) SF₄ + H₂O → H₂SO₃ + HF

Correct Answer
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Once the following equation is balanced with the smallest set of whole number coefficients, what is the sum of the coefficients? (Don't forget to include coefficients of one.) CH₄ + Cl₂→_{}CCl₄ + HCl

Correct Answer
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