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The vapour pressure of benzene is 53.3 k...

The vapour pressure of benzene is `53.3 k P_(a)` at `60.6^(@)` but it falls to `51.5 kP_(a)` when 19 g of a non-volatile organic compound is dissolved in 500 g benzene . The molar mass of the non-volatile compound is close to :

A

82

B

85

C

88

D

92

Text Solution

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The correct Answer is:
B
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Vapour pressure of benzene at 30^(@)C is 121.8 mm. When 15 g of a non-volatile solute is dissolved in 250 g of benzene its vapour pressure decreased to 120.2 mm. The molecular weight of the solute is (mol. Weight of solvent = 78)

When 10 of a non-volatile solute is dissolved in 100 g of benzene . It raises boiling point by 1^(@)C then moler mass of the solute is ______. (if K_b = 2.53 Km^(-1)

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