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How many moles of hydrogen gas are produced with an excess of hydrochloric acid?

How many moles of Hydrogen gas are produced if 35g of Al (molar mass = 27g/mol) reacts with an excess of Hydrochloric acid?

2 Al (s) + 6HCl (aq) ---> 2 AlCl3 (aq) + H2 (g) (balanced)

Answers (2)

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moles of Al available would be 35 g / 27 or 1.296

The equation says that for every 2 moles of Al used up you only get 1/2 as many moles of H2

So moles of H2 would be 1.296 x 1/2 or 0.648 moles