What mass of hydrogen gas is produced when 10.0 g aluminum react? Report your answer in grams.

Question

What mass of hydrogen gas is produced when 10.0 g aluminum react? Report your answer in grams.

6 HCl + 2 Al → 2 AlCl3 + 3 H2

Answer 1

6HCl + 2Al ==> 2AlCl₃ + 3H₂ ... balanced equation

Use dimensional analysis and stoichiometry:

10.0 g Al x 1 mol Al/26.98 g x 3 mol H₂/2 mol Al x 2 g H₂/mol H₂ = 1.11 g H₂ (3 sig. figs.0