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Atomic Number and Mass Number

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Question

A solution of ethanol in water is 10% by volume. If the solution and pure ethanol have densities $0.9866 g m l^{- 1}$ and $0.785 g m l^{- 1}$ respectively. The percentage of ethanol by weight is about:

A

7

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B

8

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C

9

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D

10

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Solution

The correct option is B 8
Weight of ethanol $= V o l u m e \times d e n s i t y = 10 \times 0.785 = 7.85 g$

Weight of solution $= V o l u m e \times d e n s i t y = 100 \times 0.9866 = 98.66 g$

Percentage weight $= \frac{Weight of ethanol}{Weight of solution} = \frac{7.85}{98.66} \times 100 = 7.95 % ≃ 8.0 %$

Hence, option B is correct.

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Q. A solution of ethanol in water is

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