for the reaction nh4no3 (s) → n2o (g) + 2h2o (l), you decompose 60 g of nh4no3 and get 11 g of n2o. what is the percent yield?
question 8 options:

25%

33%

90%

65%

With your balanced equation, you know that ideally you'll get one mole of N2O for every mole of NH4NO3 that decomposes. To find out how much there should be, we need to find the moles of Ammonium Nitrate (NH4NO3) we have.
60g NH4NO3 * (1 mole NH4NO3)/(80g NH4NO3) = 0.75 moles NH4NO3
Knowing that the ratio is one to one, you should yield 0.75 moles of N2O theoretically. But, we know that we only got 11 grams of N2O, so we actually got:
11 grams N2O * (1 mole N2O)/(44 grams N2O) = 0.25 moles N2O
So we got one third of our theoretical yield, or 33%.

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That is a lot of moles that you have