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Calculate the percent yield if 500 grams of C7H8 makes 255 grams of C7H7NO2

1 C7H8 + 1 HNO3 = 1 C7H7NO2 + 1 H2O

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500/92 = 5.43 mol of C7H8
1:1 mol ratio
Mass = mol x Mr = 5.43 x 137 = 743 g (theoretical yield)
Percentage yield = ( actual yield / theoretical yield ) x 100
500/743 x 100 = 67.3% 1dp