Question

81.4g sample of ethyl alcohol contains .002g of water. The amount of pure ethyl alcohol is.

Answer 1

pure ethyl alcohol =
81.4-0.002=81.398

Answer 2

The mass of pure ethyl alcohol is 81.398 grams

Explanation:

Pure sample is defined as the sample which do not contain any impurity.

It is usually expressed in the terms of percentage purity.

We are given:

Mass of ethyl alcohol solution, M = 81.4 grams

Mass of water, $m_1$ = 0.002 grams

Mass of pure ethyl alcohol, $m_2=M-m_1$ = (81.4 - 0.002) = 81.398 grams

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