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Question

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

A
80
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B
60
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C
20
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D
40
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Solution

The correct option is D 20

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 20.
ΔPP0=0.1
ΔPP0=W2M1W1M2
0.1= 12 g × 18 g/mol 108 g ×M2
M2= 20 g/mol
Note: W1 and W2 are weights of water and solute respectively.
M1 and M2 are molecular weights of water and solute respectively.

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