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Some chemistry MOLES questions?

#chemistry #mole

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

Thanks

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

Answers (1)

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0.72dm3 = 0.03 moles of hydrogen gas.

0.02 moles of aluminium * 26.98 = 0.5396

20g of Fe2(SO4)3: 20 / (55.85+55.85+32.07+64+32.07+64+32.07+64) = 0.0500 mol

will produce 0.150 mol of SO3

0.150*24=3.6dm3

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