Answer to Question #316879 in General Chemistry for lkglen

Question

How many grams of hydrochloric acid are needed to react with 20 g of calcium carbonate?

Answer 1

m(CaCO₃) = 20 g;

M(CaCO₃) = 100 g/mol;

M(HCl) = 36.5 g/mol;

n(CaCO₃) = m(CaCO₃)/M(CaCO₃) = 20/100 = 0.2 mol;

2HCl + CaCO₃ = CaCl₂ + CO₂ + H₂O;

For chemical reaction:

n(HCl) = 2 * n(CaCO₃) = 2 * 0.2 = 0.4 mol;

m(HCl) = n(HCl) * M(HCl) = 0.4 * 36.5 = 14.6 g.

Answer: 14.6 g.