When dealing with equilibrium and Kp:
• Kp → equilibrium units in terms of pressure
• Kp is an equilibrium expression:
▪ only gaseous species are included in the equilibrium expression
Ammonium hydrogen sulfide decomposes according to the following reaction, for which Kp = 0.11 at 250°C:
NH4HS(s) ⇌ H2S(g) + NH3(g)
If 55.0 g of NH4HS(s) is placed in a sealed 5.0-L container, what is the partial pressure of NH 3(g) at equilibrium?
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