We know that the relationship between Kc and Kp is

 We know that the relationship between Kc and Kp is

Kp = Kc(RT)∆n

What would be the value of ∆n for the reaction

NH4Cl (s) → NH3 (g) + HCl (g)

(i) 1

(ii) 0.5

(iii) 1.5

(iv) 2