2Zn+O2--------2ZnO
To calculate the percent yield we must calculate the theoretical yield of ZnO first
Using a mass-mass relationship,
Molar mass of zinc=65.38, but since we have 2 moles it will be 2×65.38=130.76g
Molar mass of ZnO =81.38, but since there are aldo 2 moles ,we have 2×81.38=162.76
So if 130.76g of Zn yields 162.76g of ZnO
Then 6.54g of Zn will yield;
6.54×162.76/130.76=8.14g of ZnO
8.14g is the theoretical yield of ZnO
So to calculate percent yield we have:
(Actual yield/theoretical yield)×100%
Percent yield =(6.91/8.14)×100%
=84.9% which is approximately 85%
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