Ammonium fluoride, a solid, decomposes to
giveNH3(g) and HF(g). At 30 °C, some NH4F(s) is placed in an evacuated container. A portion of it decomposes, and the total pressure at equilibrium is 0.995 atm. Extra NH3(g) is then injected into the container, and when equilibrium is reestablished, the partial pressure of NH3(g) is 1.42 atm.
(a) Compute the equilibrium constant in terms of pressures, Kp, for the decomposition of ammonium fluoride at 30 °C.
NH4F(s) NH3(g) + HF(g) K =
(b) Determine the final partial pressure of HF(g) in the container.
PHF = atm