Chemistry problem? Mass and percent yield?

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mcraddiction

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The formula is N2 + 3(H2) --> 2 NH3

If 186.3g of N2 react with 289.8g of H2
a. what mass of ammonia can be produced in theory?
b. if this reaction is known to have a 73.8% yield, what mass of ammonia could you expect to produce?

I have no idea what it's talking about, please help
 
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