Percentage Yield

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Percentage Yield
Reactions which go to completion are known as quantitative, but some reactions don't
always go to completion and the percentage yield of product can be calculated from these:
% yield = amount of product formed x 100
maximum amount of product possible
2.0 g of ethanol (C2H5OH) is oxidised to ethanoic acid (CH3COOH). 1.9 g of ethanoic acid is
produced. What is the percentage yield? (assume 1:1 ratio)
Moles of ethanol = 2/46 = 0.0435
Max moles of ethanoic acid = 0.0435
so max mass of ethanoic acid = 0.0435 x 60 = 2.61 g
percentage yield = 1.9/2.61 x 100 = 73%

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