Consider the following equilibrium at 395K: NH4HS(s)<-> NH3(g) + H2S(g) The partial pressure of each gas is 0.265 atm. Calculate Kc for the reaction.

Answer 1

Kp = pNH3*pH2S
Substitute partial pressures and solve for Kp. Then convert Kp to kc by
Kp = Kc*RT^{delta n}

Answer 2

Note that I omitted some parentheses.
Kp = Kc*(RT)^{delta n}