SolutionHard
Question
The vapour pressure of a solution of a non-volatile and non-electrolyte solute in a solvent is 95% of the vapour pressure of the pure solvent at the same temperature. If the molecular mass of the solvent is 0.3 times that of solute, then the mass ratio of solvent and solute is
Options
A.3: 20
B.57: 10
C.1: 5
D.4: 1
Solution
$\frac{P^{o} - P}{P} = \frac{n_{1}}{n_{2}} \Rightarrow \frac{5}{95} = \frac{m_{1}/M}{m_{2}/0.3M} \Rightarrow \frac{m_{2}}{m_{1}} = \frac{57}{10}$
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