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Q.

Calculate the weight of urea $({NH}_{2} {CONH}_{2})$ , which must be dissolved in $490 g$ water so that the solution obtained has vapor pressure is $2 %$ less than vapor pressure of pure water.

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a

$60 g$

b

$30 g$

c

$33.33 g$

d

$40 g$

answer is C.

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Detailed Solution

$∵ \frac{P ° - P_{s}}{P_{s}} = \frac{n}{N} ∴ \frac{2}{98} = (\frac{m_{area} / 60}{490 / 18}) ∴ m_{area} = 33.33 g$

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