Question 1

Calculate the molecular mass of menthol, C10H20O.

Accepted Answer

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

Question 2

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. B

Question 3

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. C

Question 4

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.

Question 5

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 moles

Question 6

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.

Question 7

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 8

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 9

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 10

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 g

Question 11

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)   12

Question 12

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)

Question 13

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 g

Question 14

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 15

The empirical formula of C6H6 is CH.

Accepted Answer

A) True 
 B)False

Question 16

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 17

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

Accepted Answer

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

Question 18

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)

Question 19

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 20

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.

Exam 3: Stoichiometry: Ratios of Combination

Calculate the molecular mass of menthol, C₁₀H₂₀O.

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

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?

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

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

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?

Calculate the mass of 3.00 moles of CF₂Cl₂.

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

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

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

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

How many grams are present in 0.885 moles of manganese?

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

The empirical formula of C₆H₆ is CH.

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

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

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

What is the mass of 0.0250 mol of P₂O₅?

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?