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11 April, 03:56

A student obtained 1.69 g of pure caffeine following recrystallization from a crude sample, which originally weighed 2.51 g. What is the percent recovery of pure caffeine from crude?

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  1. 11 April, 04:09
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    The recovery of pure caffeine is 67.3% of the original, crude sample.

    Explanation:

    Step 1: Data given

    Mass of pure caffeine = 1.69 grams

    Original mass of sample = 2.51 grams

    Step 2: What is the percent recovery of pure caffeine from crude?

    Percentage = (mass of recovery / original mass) * 100%

    Percentage = (1.69 grams/2.51 grams) * 100%

    Percentage = 67.3 %

    The recovery of pure caffeine is 67.3% of the original, crude sample.
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