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Mole to mole stoichiometry problem

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mg39:
I'm having a really hard time understanding stoichiometry. The problem attached was answering "Calculate the number of moles of H2SO4 required to react with 18.79 moles of Al." and I got it wrong. Could somebody please point out what I'm doing wrong? Thanks for your time.

Orcio_87:
You need 1,5 mole of H2SO4 for 1 mole of Al, not 3.

Tamas:
Your equation is OK.

Just use your mind and think about what happens. You need 2 mol Al for the reaction with  3 mol H2SO4
If you have 18.79 moles of Al, in this case you need [18,79 * (3/2) ] mol H2SO4 

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