SolutionHard
Question
Vapour pressure of a solution of 5 g of nonelectrolyte in 100 g of water at a particular temperature is 2985 N/m2. If the vapour pressure of pure water at this temperature is 3000 N/m2, then the molecular mass of the solute is
Options
A.60
B.120
C.180
D.360
Solution
$\frac{P^{o} - P}{P} = \frac{n_{1}}{n_{2}} \Rightarrow \frac{3000 - 2985}{2985} = \frac{5/M}{100/18} \Rightarrow M = 179.1$
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