percentage yield TOPIC 5a

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factors that affect percentage yield

1. the reaction may be reversible and may not go into completion. 2. the product may require purification. 3. product may be lost if the reaction has several steps

calculate the maximum theoretical mass of sulfur trioxide (SO3) that can be made by reacting 96g of sulfur dioxide (SO2) with an excess of oxygen. (2 SO2 + O2 = 2 SO3)

119.96

percentage yield equation

actual yield/theoretical yield x 100

suggest a reason why the theoretical mass wasn't achieved

the reaction may have been reversible so may not go to completion

only 90g of sulfur trioxide was made. calculate the percentage yield

(90/119.96) x 100 = 75.025%


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