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The problem is that the problem doesn’t provide the exact % yield. Instead, it tells you that it’s 37.91 percent. This is not typically the way the percent yield is calculated. Instead, you need to know what the actual % yield was. 6.92 percent is the actual amount of sodium sulfate in the reaction. When you use this as the denominator in the formula, you arrive at the same number: % yield 8.22.

Since the answer is telling you how much sodium sulfate is in the reaction, you need to know how much neat norepinephrine is in the product when it is produced. So the first step is to calculate the amount of sodium sulfate in the product. This will be equivalent to 1.416 moles of sodium sulfate. This value must be subtracted from the amount of neat norepinephrine the final reaction produces, which is 8.88 moles. This produces 1.416 moles of sodium sulfate. The following equation was used to find this value:

=naphthalenesulfonate + 0.822 × (predicted yield) =naphthalenesulfonate + 0.822 × 37.91%=1.4165 moles Solution: = 1.4165 moles = 0.822 × (36.03%). Then the actual percent yield is simply = (1.416 / n) × 100 = 8.22. d2c66b5586