Just follow the steps in this worked example of a stoichiometry problem.
http://www.jiskha.com/science/chemistry/stoichiometry.html
Consider the following reaction.
4 Al(s) + 3 O2(g) → 2 Al2O3(s)
It takes 1.00 L pure oxygen gas at STP to react completely with a certain sample of aluminum. What is the mass of aluminum reacted?
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