Question

The equilibrium constant for the equilibrium \(PCl_5(g)\rightleftharpoons PCl_3(g)+Cl_2(g)\) at a particular temperature is \(2\times10^{-2}\ \text{mol dm}^{-3}\). The number of moles of \(PCl_5\) that must be taken in a one-litre flask at the same temperature to obtain a concentration of 0.20 mol of chlorine at equilibrium is

• A. 2.0
• B. 2.2
• C. 1.8
• D. 0.2
• E. 0.1

Hint:

For decomposition equilibrium, first find equilibrium concentrations, then add the decomposed amount to get the initial amount.

Answer 1

The Correct Option is B