Ammonium bisulfide, NH4HS, forms ammonia, NH3 and hydrogen sulfide, H2S, through the reaction
NH4HS(s)NH3(g)+H2S(g)
This reaction has a Kp value of 0.120 at 250C.
An empty 5.00-L flask is charged with 0.250g of pure H2S(g), at 25 ?C.
Question - What is the initial pressure of H2S(g) in the flask? Show your steps