Q.
The vapour pressure of solvent is 20 torr, while that of its dilute solution is 17 torr, the mole-fraction of the solvent is
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a
0.6
b
0.85
c
0.5
d
0.7
answer is B.
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Detailed Solution
From question Po=20 torr,PS=17 torr∴ Po−PsPo=X solute320=X solute or X solute = 0.15X solvent = 1-0.15=0.85
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