Mole fraction of A in H2O is 0.2. The molality of A in H2O is :

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13.9

15.5

14.5

16.8

answer is A.

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Detailed Solution

Molality =X2/X11000/gmwtWhere X2 = mole fraction of soluteX1 = mole fraction of solventgmwt = gram molecular weight of solventX1+X2=1X2=0.2X1=1−0.2=0.8m=0.2/0.81000/18=13.9

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