Question

Calculate Kc for the following reaction at STP if Kp = 20.
NH4HS (s) ⇌ H2S (g) + NH3 (g)

Answer 1

Explanation:

K

p

= 0.11 Atm

2

The solid reactant has zero partial pressure

So Kp= PNH3.PH2S

Here P denotes the partial pressure of each gas.

PNH3+ PH2S =0.660 atm

PNH3 = 0.33 atm

PH2S = 0.33 atm

So now they are in 1 : 1 ratio

So Kp= 0.109 atm2