Question

Two containers each containing liquid water are connected as shown in diagram
Given that vapour pressure of $H_2\left(l\right)$ at $300K$ are $22mm$ of $Hg$ and $40mm$ of $Hg$. The final pressure in each container if valve is opened while keeping the containers at the given temperature is?

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

Answer 1

The correct option is A $22mm$ 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 the container Y diffuse into 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.

The final pressures in the two containers will be the same i.e,22mm of Hg