A solution of ethanol in water is 10% by volume. If the solution and pure ethanol have densities of 0.9866 g/cc and 0.785 g/cc respectively. The percent by weight is nearly?

7.95%

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17%

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9.86%

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16.2%

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Solution

The correct option is A 7.95%
Volume of ethanol = 10 ml
Volume of solution = 100 ml
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 = $100 \times 0.9866$
= 98.66 g
Weight percent of ethanol = $\frac{7.85}{98.66}$ $\times 100$
= $7.95 %$

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A solution of ethanol in water is 10% by volume. If the solution and pure ethanol have densities of 0.9866 g/cc and 0.785 g/cc respectively. The percent by weight is nearly?

The correct option is A 7.95%Volume of ethanol = 10 ml Volume of solution = 100 mlWeight of ethanol = Volume×density = 10×0.785 = 7.85 gWeight of solution = 100×0.9866 = 98.66 gWeight percent of ethanol = 7.8598.66 ×100 = 7.95%

The correct option is A 7.95%
Volume of ethanol = 10 ml
Volume of solution = 100 ml
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 = $100 \times 0.9866$
= 98.66 g
Weight percent of ethanol = $\frac{7.85}{98.66}$ $\times 100$
= $7.95 %$