Tiglath M. answered • 03/16/16

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UC Berkeley Grad for Chemistry, Organic Chemistry and Biology Tutoring

The percent yield is calculated using the following formula.

percent yield = (actual yield/theoretical yield)*100

In this case actual yield (the mass found from the experiment) is 4.21 g and the theoretical yield is 4.89 g. All you need to do is to plug these numbers in the formula given above to find the percent yield.

The percent error can be calculated using the following formula.

percent error = |theoretical - experimental/theoretical|*100 where theoretical-experimental is the deviation between the experimental and theoretical values.

Hope this answers your question.