Q.

12g of a non-volatile solute dissolved in 108g of water  produces the relative lowering of vapour pressure of 0.1.  The molecular mass of the solute is 

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a

60

b

20

c

40

d

80

answer is C.

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Detailed Solution

PoPsPo=nN=wm×MW 0.1=12m×18108m=12×180.1×108=20

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12g of a non-volatile solute dissolved in 108g of water  produces the relative lowering of vapour pressure of 0.1.  The molecular mass of the solute is