Posted by komal on Wednesday, April 13, 2011 at 11:45pm.
You use both. This is a limiting reagent type problem; I know that because the problem gives BOTH reactants. That means that one of them is used completely while the other one will have some remaing after the reaction has occurred. I work these problem by working TWO simple stoichiometry problems (simple meaning they are not limiting reagent problems). Use either reagent and determine how much of the product is formed. Then use the other one and determine the amount of the same product. The answers probably will be different; the correct answer in limiting reagent problems is ALWAYS the smaller value and the reagent producing that value is the limiting reagent. Here is an example of a simple stoichiometry problem. Just follow the steps. Post your work if you get stuck.
oops.
http://www.jiskha.com/science/chemistry/stoichiometry.html
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