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Class 11
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Equilibrium
dihydrogen gas used in haber rsquo s process is pr...

Question:
Dihydrogen gas used in Haber’s process is produced by reacting methane from natural gas with high temperature steam. The first stage of two stage reaction involves the formation of CO and H₂. In second stage, CO formed in first stage is reacted with more steam in water gas shift reaction,

CO (g) + H₂O (g) ↔ CO₂ (g) + H₂ (g)

If a reaction vessel at 400°C is charged with an equimolar mixture of CO and steam such that P_CO = P_H2O = 4.0 bar, what will be the partial pressure of H₂ at equilibrium? K_p= 10.1 at 400°C.

Answer:

Let the partial pressure of both carbon dioxide and hydrogen gas be p. The given reaction is:

CO (g) + H₂O (g) ↔ CO₂ (g) + H₂ (g)

Initial Conc. 4.0 bar 4.0 bar 0 0

At equilibrium 4.0-p 4.0-p p p

It is given that K_p = 10.1

Now,

Hence, at equilibrium, the partial pressure of H₂ will be 3.04 bar.

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