CHEMISTRY please help?

Posted on 2016-09-23 18:23:00 in Chemistry by MEGAN

When exposed to air, aluminum metal, Al, reacts with oxygen, O2, to produce a protective coating of aluminum oxide, Al2O3, which prevents the aluminum from rusting underneath. The balanced reaction is shown here: 
4Al+3O2→2Al2O3 

What is the theoretical yield of aluminum oxide if 2.80 mol of aluminum metal is exposed to 2.40 mol of oxygen? 
Express your answer with the appropriate units.

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