Question

The lowering of vapour pressure due to a solute in a 1 m aqueous solution at ${100}^{o}C$ is:

• A. 13.44 torr
• B. 14.12 torr
• C. 312 torr
• D. 352 torr

Answer 1

Answer: (A)

13.44 torr

$\frac{\Delta P}{P^o}=\frac{W_2\times M{w}_1}{M{w}_2\times W_1}$

$\Delta P=\frac{1\times 18}{1000}\times 760=13.68$

(at ${100}^{o}C$, Vapour Pressure =760 torr)

Hence, the correct option is $A$