Chemistry · Chemical Equilibrium

When 5.1 g of solid NH4HS (Molar mass = 51 g/mol) is introduced into a two-litre evacuated flask at 27°C, 20% of the solid decomposes into gaseous ammonia and hydrogen sulphide. The Kp for the reaction at 27°C is x × 10-2. The value of x (as an integer) is: [Given: R = 0.082 L atm K-1 mol-1]