First slide

Theory of dilute solutions

Question

What mass of urea be dissolved in 171 g of water so as to decrease the vapour pressure of water by 5%?

Moderate

A

15 g
B

20 g
C

25 g
D

30 g

Solution

$\frac{∆ P}{P_{A} °} = X_{B} = 0.05 (g i v e n) 0.05 = \frac{n_{B}}{n_{B} + n_{A}} = \frac{n_{B}}{n_{B} + \frac{171}{18}} \Rightarrow n_{B} = 0.5 \Rightarrow W_{u r e a} = 0.5 \times 60 = 30 g$

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