An equilibrium mixture for the reaction, 2H2 S(g) ⇌ 2H2(g) + S2(g) had 5 mole of H2S, 0.10 mole of H2 and 0.4 mole of S2 in one liter vessel. The value of equilibrium constant (K) in mol litre^-1 is : 0.10 mole of H2 and 0.4 mole of S2 in one liter vessel. [...]