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Question

The vapour pressure of water at 27oC is 0.2463atm. Calculate the values of Kp and Kc at 27oC for the equilibrium H2O(lH2O(g)
Using the equilibrium constant
Which of the following reactions goes almost all the way to completion, and which proceeds hardly.

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Solution

H2O(l)H2O(g)T=270C
Vapour pressure =PH2O=0.2463
KP=PH2O=0.2463
KP=KC(RT)Δn
Here Δn=10=1
KC=KPRT=0.24630.0821×300=0.01
Here Kα1 So Kb>Kf(Kf/Kb=K)
backward reaction goes to completion, forward is hard.

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