The given reaction is: 2NOCl(g)⇌2NO(g)+Cl2(g) For the above reaction, the value of ∆n can be calculated as: Δn= Moles of gaseous products Moles of gaseous reactants =3−2 =1 The equilibrium constant (Kc) can be calculated as: Kp=Kc(RT)Δn 4.157×10−4=Kc(0.083×1000)1 Kc=5.0×10−6