On mixing 15 mL of ethyl alcohol of density 0-70 g mL -1 with 15 mL of pure water at 4- C- the resulting solution is found to have a density of 1-02 g mL -1- The percentage contraction in volume is-A- 8-02 -B- 16-67 - 18-18 -D- 12-42 -

The correct option is B 16.67%Mass of ethyl alcohol =15× 0.70 g Mass of water =15× 1 Total mass of the solution =15+0.70× 15 g =25.50 g Volume of the solution ...

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Standard XII

Physics

Specific Heat Capacity

On mixing 15 ...

Question

On mixing $15 mL$ of ethyl alcohol of density $0.70 {g mL}^{- 1}$ with $15 mL$ of pure water at $4^{\circ} C$ , the resulting solution is found to have a density of $1.02 {g mL}^{- 1}$ . The percentage contraction in volume is:

8.02 %

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12.42 %

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16.67 %

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18.18 %

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Solution

The correct option is C $16.67 %$
Mass of ethyl alcohol $= 15 \times 0.70 g$
Mass of water $= 15 \times 1$
Total mass of the solution $= 15 + 0.70 \times 15 g$
$= 25.50 g$
Volume of the solution $= \frac{mass}{density} = \frac{25.50}{1.02}$
$= 25 mL$
% decrease in volume
$= \frac{volume lost}{total volume} = \frac{30 - 25}{30} \times 100$

$= 16.67 %$

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On mixing 15 mL of ethyl alcohol of density 0.70 g mL−1 with 15 mL of pure water at 4 ∘C, the resulting solution is found to have a density of 1.02 g mL−1. The percentage contraction in volume is:

The correct option is C 16.67%Mass of ethyl alcohol =15×0.70 g Mass of water =15×1 Total mass of the solution =15+0.70×15 g =25.50 g Volume of the solution =massdensity=25.501.02 =25 mL % decrease in volume =volume losttotal volume=30−2530×100 =16.67%

On mixing $15 mL$ of ethyl alcohol of density $0.70 {g mL}^{- 1}$ with $15 mL$ of pure water at $4^{\circ} C$ , the resulting solution is found to have a density of $1.02 {g mL}^{- 1}$ . The percentage contraction in volume is: