what mass of hydrogen gas can be produced by reacting 6 moles of aluminum with HCI?

Answer 1

First, write the correctly balanced equation so that you can see the relationship of moles of H2 gas to moles of aluminum.

2Al(s) + 6HCl(aq) ==> 2AlCl₃(aq) + 3H₂(g) ... balanced equation (note: 2 mols Al => 3 mols H₂ gas)

Next, use the 6 mols of Al provided, to find the moles of H₂ gas that can be formed.

6 mols Al x 3 mols H₂ / 2 mols Al = 9 moles of H₂ gas is formed

Finally, convert the 9 moles of H₂ gas into grams by using the molar mass of H₂.

9 moles of H₂ x 2 g H₂ / mol H₂ = 18 g H₂ gas is formed