Ammonium bisulfide, NH4HS, forms ammonia, NH3, and hydrogensulfide, H2S, through the reaction
NH4HS(s)?NH3(g)+H2S(g)
This reaction has a Kp value of 0.120 at 25 ?C.
An empty 5.00-L flask is charged with 0.400g of pure H2S(g), at 25?C.
What is the initial pressure of H2S(g) in theflask?