4. Ammonium hydrogen sulfide, NH4HS(s), used as a photographic developer, is unstable and dissociates at room temperature.
NH4HS(s) NH3(g) + H2S(g) Kp(atm) = 0.108 at 25 oC A sample of NH4HS(s) is introduced into an evacuated flask at 25 oC. What is the total gas pressure at equilibrium?