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A solution of ethanol in water is 10% by volume. If the solution and pure ethanol have densities of 0.9866g//"cc" and 0.785g//"cc" respectively, find the per cent by weight. |
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Answer» Solution :VOLUME of ethanol `=10mL`, VOL of soultion `=100ML` WEIGHT of ethanol `=` volume `xx` density `=10xx0.785=7.85g` Weight of solution `=100xx0.9866=98.66g` `:.` weight per CENT `=(7.85)/(98.66)xx100=7.95%` |
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