AP - Advanced Placement Chemical Reactions and Stoichiometry 1

Question 1

In the reaction 2Al(s) + 3Cl₂(g) → 2AlCl₃(s), 5.40 g of Al (MM = 26.98 g/mol) reacts with excess Cl₂, yielding 21.3 g of AlCl₃ (MM = 133.33 g/mol).
What is the percent yield of this reaction?

Accepted Answer

79.8%

Answer

62.3%

Answer

83.4%

Answer

95.2%

Question 2

Which net ionic equation correctly represents the reaction between Na₂SO₄(aq) and BaCl₂(aq)?

Accepted Answer

Ba²⁺(aq) + SO₄²⁻(aq) → BaSO₄(s)

Answer

2Na⁺(aq) + SO₄²⁻(aq) → Na₂SO₄(s)

Answer

2Cl⁻(aq) + 2Na⁺(aq) → 2NaCl(s)

Answer

Ba²⁺(aq) + 2Cl⁻(aq) + 2Na⁺(aq) + SO₄²⁻(aq) → BaSO₄(s) + 2NaCl(s)

Question 3

In a titration, 24.5 mL of 0.150 M NaOH is required to neutralize 15.0 mL of H₂SO₄ solution. Using the reaction 2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂O, what is the molarity of the H₂SO₄?

Accepted Answer

0.123 M

Answer

0.0613 M

Answer

0.245 M

Answer

0.300 M

Question 4

Propane burns completely according to: C₃H₈(g) + 5O₂(g) → 3CO₂(g) + 4H₂O(g). If 11.0 g of C₃H₈ (MM = 44.11 g/mol) is combusted with excess O₂, what mass of CO₂ (MM = 44.01 g/mol) is produced?

Accepted Answer

32.9 g

Answer

11.0 g

Answer

22.0 g

Answer

44.0 g

Question 5

Which of the following represents a single-displacement (single-replacement) reaction?

Accepted Answer

Zn(s) + 2AgNO₃(aq) → Zn(NO₃)₂(aq) + 2Ag(s)

Answer

CaCO₃(s) → CaO(s) + CO₂(g)

Answer

2Na(s) + Cl₂(g) → 2NaCl(s)

Answer

HCl(aq) + NaOH(aq) → NaCl(aq) + H₂O(l)

Question 6

In the reaction 3CuCl₂ + 2Al → 3Cu + 2AlCl₃, 25.4 g of CuCl₂ (MM = 134.45 g/mol) is combined with 5.40 g of Al (MM = 26.98 g/mol). Which reagent is limiting, and what is the theoretical yield of Cu (MM = 63.55 g/mol)?

Accepted Answer

CuCl₂ is limiting; 12.0 g Cu

Answer

Al is limiting; 19.1 g Cu

Answer

CuCl₂ is limiting; 8.01 g Cu

Answer

Al is limiting; 12.0 g Cu