Chemistry Equilibrium - 15.00g of solid ammonium hydrogen sulfide is introduces into

[Kelsie]

a 500. mL flask at...? 15.00g of solid ammonium hydrogen sulfide is introduces into a 500. mL flask at 25'C, the flask is sealed, and the system is allowed to reach equilibrium. What is the partial pressure of ammonia in this flask if Kp=0.108 at 25'C for
NH4HS(s) --> NH3(g) + H2S(g)?
Thank you!