Thread: Determining partial pressure View Single Post
 Sep 14th 2017, 06:16 PM #1 pineapplepizza Junior Member   Join Date: Sep 2017 Location: California Posts: 1 Determining partial pressure Ammonium hydrogen sulfide, a solid, decomposes to give NH3(g) and H2S(g). At 25°C, some NH4HS(s) is placed in an evacuated container. A portion of it decomposes, and the total pressure at equilibrium is 0.659 atm. Extra NH3(g) is then injected into the container, and when equilibrium is reestablished, the partial pressure of NH3(g) is 0.750 atm. (a) Compute the equilibrium constant for the decomposition of ammonium hydrogen sulfide. (b) Determine the final partial pressure of H2S(g) in the container. For (a), I assumed that the partial pressures of NH3 and H2S are equivalent since they have the same stoichiometry coefficient and divided the total pressure at equilibrium of 0.659 atm by 2 to find the partial pressures. I am not sure how to approach (b). Do I assume the partial pressures of NH3 and H2S are equivalent again?