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Question

On mixing 15.0 ml of ethyl alcohol of density 0,792gml1 with 15 ml of pure water at 4oC, the solution is found to have a density of 0.924gml1. The percentage contraction in volume is:

A
8%
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B
2%
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C
3%
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D
4%
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Solution

The correct option is B 3%

Mass of alcohol =15×0.792=11.88 g

Mass of water =15×1=15 g

Total mass =11.88+15=26.88 g

Volume of solution =mass of componentsdensity of solution

=26.880.924=29.0909 mL

Expected volume =(15+15)=30 mL

Difference =3029.0909=0.909 mL

% Concentration in volume = differenceexpected volume×100

=0.90930×100

=3.03%


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