Copper (II) oxide solid and hydrogen gas react to form elemental copper and water.

Question

a. Write a balanced equation for the reaction.

b. How many grams of Cu can be produced when 19.9g of CuO react with 2.02g of H2?

Answer 1

a.). CuO(s) + H₂(g) ==> H₂O + Cu

b.). 19.9 g CuO x 1 mol CuO/79.5 g x 1 mol Cu/mol CuO x 63.5 g Cu/mol Cu = 15.9 g Cu

2.02 g H₂ x 1 mol/2 g x 1 mol Cu/mol H₂ x 63.5 g Cu/ mol Cu = 128 g Cu

Since Cu is limiting, only 15.9 g Cu will form.