Solid `NH_4HS` is taken in an evacuated vessel and allowed to dissociate at a certain temperature until the total gas pressure is 0.66 atm. What would be the value of `K_p` for the following reaction?
`NH_4HS(s) iff NH_3(g) + H_2S(g)`
What would be the partial pressure of `H_S` if additional `NH_3` is introduced into the equilibrium mixture at the same temperature until the partial pressure of `NH_3` is 0.921 atm?

Explanation

0.1089 atm