SolutionHard
Question
If P0 and P are the vapour pressures of a solvent and its solution respectively and N1 and N2 are the mole fractions of the solvent and non-volatile solute respectively, then correct relation is :
Options
A.P = P0N2
B.P = P0N1
C.P0 = PN1
D.P = P0(N1/N2)
Solution
Acc. of Rault′s law P = PA + PB
for non volatile solute = PB = 0
Ps = PA
Ps = P0A XA XA = mole fractions of solvent = N1
so P = P0 N1 P0A = P0.
for non volatile solute = PB = 0
Ps = PA
Ps = P0A XA XA = mole fractions of solvent = N1
so P = P0 N1 P0A = P0.
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