Question - Theoritical and Percent Yield?
salicylic acid acetic anhydride aspirin
Reactants: 1.75 g salicylic acid with 2.33 g acetic anhydride.
Yield: 1.75 g aspirin.
XXX g - Theoritical Yield (Sig Figs)
XXX percent yield % (Sig Figs)
Can anybody tell me the answer to the following question
for the first one i got 2.29, however the program refuses to accept my answer as correct
Answer:
So what you need to do first is to calculate the limitng reagent. In this case, since all stoichiometric ratios are 1:1 (that is, none of the reactants or products have a numerical coefficent), the limiting reagent is the one with the smaller number of starting moles. From that, you can use the fact that 1 mole of limting reagent wil produce 1 mole of aispirn and therefore the number of moles of LR = the number of moles of product. Use the molecular weight of aspirin to convert this number into grams and then you can easily find the % yield by taking
actual grams/theoretical grams * 100
Tony is right about the method for solving this problem. Your answer is close, so you must have figured out that salicylic acid is the limiting reagent. Check the molecular weights you are using in your calculation. I got an answer of 2.28g
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