Ammonium bisulfide, NH4HS, forms ammonia, NH3, and hydrogensulfide, H2S, through the reaction
NH4HS(s)⇌NH3(g)+H2S(g)
This reaction has a Kp value of 0.120 at 25 ∘C.An empty 5.00-Lflask is charged with 0.350 g of pure H2S(g), at 25 ∘C.
Part A: What is the initial pressure of
H2S(g) in the flask?
Part B: In addition to the
H2S already present in the flask, solid NH4HS is added untilthere is excess unreacted solid remaining. What are the partialpressures of
NH3 and H2S at equilibrium, that is, what are the values ofPNH3and PH2S, respectively?
Part C:What is the mole fraction,
χ, of H2S in the gas mixture at equilibrium?
Part D:What is the minimum mass of
NH4HS that must be added to the 5.00-L flask when charged withthe 0.350 g of pure H2S(g), at 25 ∘C to achieve equilibrium?
