Question

18a) A chemist combined 0.786 g of aluminum with 25.0 mL of a 0.21 M solution of CuCl2. Which substances will be present in the flask after the reaction has completed?

A) Solid copper, solid aluminum, and aqueous aluminum chloride
B) Solid copper and aqueous aluminum chloride
C) Solid aluminum and aqueous copper(II) chloride
D) Solid copper and a solution containing Cu2+ (aq), Al3+ (aq), and Cl− (aq)
E) Solid aluminum and a solution containing Cu2+ (aq), Al3+ (aq), and Cl− (aq)

18b) A chemist combined 0.786 g of aluminum with an excess of copper(II) chloride solution. After the reaction had completed, the chemist filtered out the solid copper, dried it, and weighed it. The mass of solid copper isolated was 2.666 g. What is the percent yield of this reaction?

A) 3.39% B) 339% C) 96% D) 29.5% E) 69%

Answer 1