Answers

1. For the reaction

CaCO₃(s) + 2 HCl(aq) ----> CaCl₂(aq) + CO₂(g) + H₂O(l)

how many grams of CaCl₂ could be obtained if 15.0g HCl is allowed to react with excess

CaCO₃?

Answer: 22.8 g CaCl₂

2. Consider the reaction

Mg₂Si(s) + 2H₂O(l) ----> 2Mg(OH)₂(aq) + SiH₄(g)

Calculate the number of grams of silane gas, SiH₄, formed if 25.0 g of Mg₂Si reacts with excess

H₂O.

Answer: 10.5 g SiH₄

3. Fe₃O₄ reacts with CO according to the reaction

Fe₃O₄(s) + 4CO(g) ----> 4CO₂(g) + 3Fe(s)

If 234 g CO is reacted with excess Fe₃O₄, what mass of CO₂ will be produced?

Answer: 368 g CO₂