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2014-10-02T18:58:03+05:30

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To calculate concentration by volume, first convert into volumes.
Volume of ethanol = 0.17l
Volume of water = 56g/(1g/cm³) = 56 ml = 0.056l
(taking density of water = 1g/cm³)

Total volume of solution = 0.17 + 0.056 = 0.226l
Concentration of ethanol =  \frac{volume of ethanol in solution}{volume of total solution}  × 100
⇒ Concentration =  \frac{0.17}{0.226}  × 100
Concentration = 75.22%
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2014-10-05T08:30:31+05:30

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Concentration of ethanol in % = 100 * volume of ethanol / total volume of solution
               = 100 * volume of Ethanol / [ volume of ethanol + volume of water ]
              = 100 * 170 cc / [ 170 cc + 56 cc ] = 75.22 %

      as 1 liter = 1000 cc    and   1 gm of water occupies 1 cc.

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