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Some chemistry MOLES questions?

just some questions i got for homework... Want to check my answers.

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When aluminium is reacted with an excess of hydrochloric acid, 0.72 dm3 of hydrogen at RTP was formed. Calculate the mass of aluminium used.

2Al +6HCl ----> 2AlCl3 + 3H2

One more

Calculate the volume of sulphur trioxide formed when 20.0 g of iron (III) sulphate is heated

Fe2 (SO4) 3 -----> Fe2O3 + 3SO3

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