For the following reaction, find Kc at 25°C

Question

For the following reaction, find Kc at 25°C.

NH4HS(s)    H2S(g) + NH3(g)       ΔG° = 17.5 kJ at 25°C

Answer 1

Using ∆Gº = - RT ln Kc and substituting values of R = 0.008314 kJ/Kmol and T = 298K, we obtain...

17.5 kJ = -(0.008314)(298) ln Kc

17.5 = -2.48 ln Kc

-ln Kc = 7.06

Kc = 8.6x10^-4