Question

At 473 K, equilibrium constant $K_{c}$ for decomposition of phosphorus pentachloride, PCl₅ is 8.3 x 10⁻³. If decomposition is depicted as, PCl₅ (g) ⇆ PCl₃ (g) + Cl₂ (g); ΔHϴ 124.0 kJ mol⁻¹ . write an expression for $K_{c}$ for the reaction.

Answer 1

From the given chemical reaction, PCL5(g)---PCL3 (g) + CL2 (g), the equillibrium constant Kc will be = [PCL3(g)] [Cl2(g)] / [PCl5(g)].

Equillibrium constant is the state which is obtained where the solids will be ignored and the gaseous reactants will be taken in to consideration.

This is the main ideology behind this principle and is applied for all the chemical reactions.