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Question

A bacterium can convert xylose to lactic acid with a percent yield of 85%. What mass of lactic acid would be produced from 50.0 g sample of xylose by this bacterium? (At. mass of xylose(C5H10O5)=150 g/mol, At. of lactic acid(C3H6O3)=90 g/mol).

A
58.8 g
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B
85 g
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C
50 g
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D
42.5 g
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Solution

The correct option is D 42.5 g
Percent Yield is the ratio of actual yield of a substance to the theoretical yield.
Percent Yield =Actual YieldTheoretical Yield×100
Given, Theoretical Yield 50 g, Percent Yield =85
So, (85100×50)= Actual Yield
Actual Yield =42.5 g

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