In the equation Kp = Kc (RT) Δn,∆n equals to the difference b/w the number of moles of gaseous products and gaseous reactants where, Kp and Kc are the Equilibrium constants at constant pressure and temperature respectively.
For the reaction NH4 Cl (s) ⇋ NH3 (g) + HCl (g)
The no. of moles of reactant is 1 ( 1 molecule of ammonium chloride involved) and the no. of moles of reactant is 2 ( ammonia and HCl )
Then ,∆n = (2 – 1 ) = 1.
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