2. NH4Cl(s) ↔ NH3(g) + HCl(g) ∆H = +42.1 kilocalories Suppose the substances in the reaction above are at equilibrium at 600K in volume V and at pressure P. State whether the partial pressure of NH3(g) will have increased, decreased, or remained the same when equilibrium is reestablished after each of the following disturbances of the original system. Some solid NH4Cl remains in the flask at all times. Justify each answer with a one-or-two sentence explanation: (a) A small quantity of NH4Cl is added. (b) The temperature of the system is increased. (c) The volume of the system is increased.

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