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Question

Addition of 4.0 g of a non-volatile solute to 54.0 g water results in a lowering of vapour pressure by 1.0%. What is the molar mass of the non-volatile solute?

Options

A.132
B.66
C.133.33
D.333

Solution

$\frac{P^{o} - P}{P^{o}} = = \frac{n_{1}}{n_{2}} \Rightarrow \frac{1}{99} = \frac{4/M}{54/18} \Rightarrow M = 132$

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