Question

Two container each containing liquid water are connected as shown in diagram.
Given that pressure of $H_{2}O\left(l\right)$ at 300 K & 350 K are 22 mm of Hg and 40 mm of Hg. The final pressure in each container if valve is opened while keeping the containers at the given temperature is:

• A. 22 mm of Hg
• B. 40 mm of Hg
• C. 31 mm of Hg
• D. 62 mm of Hg

Answer 1

The correct option is A 22 mm of Hg

Solution:- (A) $22\text{mm of Hg}$

The vapour pressure in the container $Y$ is higher than the vapour pressure in the container $X$.

When the valve is opened, the vapours from container $Y$ diffuse into the container $X$ and condense there.

When the equilibrium is re-established, the mass of liquid water in the container $Y$ decreases and the mass of the liquid water in the container $X$ increases.

Thus the final pressure in the two containers will be same, i.e., $22\text{mm of Hg}$.