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Q.

Calculate the weight of urea (NH2CONH2), which must be dissolved in 490 g water so that the solution obtained has vapor pressure  2% less than vapor pressure of pure water.

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a

40 g

b

33.33 g

c

30 g

d

60 g

answer is C.

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Detailed Solution

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According to Raoult's law:

P°-PsPs=nsoluteNsolvent 298=marea/60490/18 marea=33.33 g

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