A solution of ethanol in water is \( 10 \% \) by volume. If the solution and pure ethanol have d...

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A solution of ethanol in water is \( 10 \% \) by volume. If the solution and pure ethanol have densities of \( 0.9866 \mathrm{~g} / \mathrm{cc} \) and \( 0.785 \mathrm{~g} / \mathrm{cc} \) respective/y, find the per cent by weight of ethanol.
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