Question

A solid XY kept in an evacuated sealed container undergoes decomposition to form a mixture of gases X and Y at temperature T. The equilibrium pressure is 10 bar in the vessel. K_p for this reaction is ______.

Options

• 25

• 100

• 10

• 5

Answer 1

A solid XY kept in an evacuated sealed container undergoes decomposition to form a mixture of gases X and Y at temperature T. The equilibrium pressure is 10 bar in the vessel. K_p for this reaction is 25.

Explanation:

\[\ce{XY(s) <=> \underset{P}{X(g)} + \underset{P}{Y(g)}}\] ...(Assume)

At equilibrium,

Total pressure = 2P = 10 bar

∴ P = 5

Now K_P = (P_X) (P_Y) = p² = (5)² = 25