22-1 CHEMISTRY HELP PLS

Question

How many liters of hydrogen gas at STP can be generated from the reaction of excess hydrogen chloride with 79.7 g of aluminum?

Answer 1

Write a balanced equation:

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

moles of H₂ gas formed = 79.7 g Al x 1 mol Al / 26.98 g x 3 mol H₂ / 2 mol Al = 4.43 moles H₂ gas formed

At STP, one mole of any ideal gas occupies 22.4 L...

Volume H₂ gas @ STP = 4.43 moles H₂ x 22.4 L / mol = 99.3 liters of H₂ gas