Solutions Question 345

Question: 12 g of a nonvolatile solute dissolved in 108 g of water produces the relative lowering of vapour pressure of 0.1. The molecular mass of the solute is:

Options:

A) 80

B) 60

C) 20

D) 40

Show Answer

Answer:

Correct Answer: C

Solution:

$ \frac{P{}^\circ -P_{s}}{P{}^\circ }=\frac{n}{N}=\frac{w}{m}\times \frac{M}{W} $

$ 0.1=\frac{12}{m}\times \frac{18}{108} $

$ m=\frac{12\times 18}{0.1\times 108}=20 $



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