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Some chemistry MOLES questions?

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


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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