Question

Equilibrium with partial pressure

15.13 g of solid ammonium hydrogen sulfide is introduced into a 536-mL flask at 25.1 °C; the flask is sealed, and the system is allowed to reach equilibrium. What isthe partial pressure of ammonia in this flask if Kp = 0.891 at 25.1 °C for the reaction
NH4HS(s) ? NH3(g) + H2S (g)?

Do I have to find Kc first ?

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