Homework Help: chemistry

Posted by krystal on Tuesday, February 14, 2012 at 10:55pm.

Aluminum and oxygen react to form aluminum oxide.

4 Al + 3 O2 2 Al2O3

a. What is the limiting reactant if 36.4 g Al are reacted with 36.4 g of O2?

O2

b. What is the theoretical yield of Al2O3, in grams?

68.8 g

c. If 22.2 g of Al2O3 are obtained, what is the percent yield?

32.3

chemistry - DrBob222, Tuesday, February 14, 2012 at 11:03pm
I think the limiting reagent is Al.
Your 68.8g, however, is correct for theoretical yield of Al2O3 which means you must have used 36.4g Al to solve for g Al2O3.
The limiting reagent is the substance that is completely used.
%yield is correct.

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