Ammonium hydrogen sulfide dissociates as follows
`NH_4HS(s) hArr H_2S(g) +NH_3(g)`
if solid `NH_4 HS` is placed in an evacuated flask at a certain temperature, it will dissociate until the total gas pressure is 500 torr. Calculate the following.
(a) Equilibrium constant for the dissociation reaction
(b) if the additional `NH_3` is introduced into the equilibrium mixture without change in temperature until the partial pressure of ammonia is 700 torr.
(i) What is the partial pressure of `H_2O` under these conditions
(ii) What is the total pressure in the flask ?

Answer

0.329 atm
(a) `0.108 atm^2`
(b) 0.117 atm
(ii) 789 torr