Step-by-step explanation
NH4Cl(s) = NH4+(aq) + Cl-(aq) AH = +3.5 kcal/mole
We have some changes that shift the equilibrium to the right, according to Le Châtelier's principle.
I will write some of them:
By Adding amount of NH4Cl or by increasing the temperature because according to the heat of the reaction this is an endothermic reaction.
Answer: Increasing the temperature of the system.