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%