Question

Two containers, X and Y at 300K and 350K with water vapour pressures 22 mm and 40 mm respectively a are connected, initially closed with a valve. If the valves opened.

• A. The final pressure in each container is 31 mm
• B. The final pressure in each container is 40 mm
• C. Mass of $H_{2}O$(l) in X increases
• D. Mass of $H_{2}O$(l) in Y decreases roar.

Answer 1

Answer: (A)

$\begin{array}{c}\text{- The vapour pressur in the cointainer}y\text{is higher}\\ \text{than the vapour pressure in the container}x\text{.}\\ \text{- When the value is opened, the vapour from}\\ \text{container y diffuse in the container}x\\ \text{and condense there.}\\ \text{- When the equilibrium is re-established, the}\\ \text{mass of liquid water in the contaier y}\\ \text{decreases and container}x\text{increases.}\\ \text{Hence the answer is, option (}A\text{)}\\ \text{i.e. The final pressure in each container is}31mm\text{.}\end{array}$