We know that the relationship between K_c and K_p is K_p = K_c(RT)^∆n What would be the value of$∆\mathrm{n}$ for the reaction NH₄Cl(s) ⇆ NH₃(g) + HCl(g)

The relationship between K_p and K_c is
K_p = K_c (RT) ^∆n
Where ∆n = (number of moles of gaseous products) – (number of moles of gaseous reactants)
For the reaction,
NH₄Cl (s) ⇆ NH₃(g) + HCl(g)
∆n = 2 – 0 = 2