The given reaction is: 2NOCl(g) ⇌ 2NO(g) + Cl2(g) Δn= Moles of gascous products - Moles of gascous reactants =3−2 =1 Now, the value of Kc is calculated as: Kp=Kc(RT)Δn =4×10−6mol∕L(0.0831L‌bar‌K−1‌mol−1×1000K)2 =3.32×10−4‌bar