Dihydrogen gas is obtained from natural gas ...

NCERT Class XI Chemistry Equilibrium Solutions

Question : 28 of 73

Marks: +1, -0

Dihydrogen gas is obtained from natural gas by partial oxidation with steam as per following endothermic reaction:

\mathrm{CH}_{4(g)} + \mathrm{H_2O}_{(g)}

⇌

\mathrm{CO}_{(g)} + 3\mathrm{H}_{2(g)}

(a) Write an expression for

K_p

for the above reaction.

(b) How will the values of

K_p

and composition of equilibrium mixture be affected by

(i) increasing the pressure

(ii) increasing the temperature (iii) using a catalyst?

Solution:

(a)

K_p

\frac{p_{CO} \times p_{H_2}^3}{p_{CH_4} \times p_{H_2O}}

(b) (i) By Le Chatelier’s principle, on increasing pressure, equilibrium will shift in the backward direction where number of moles decreases. (ii) As the given reaction is endothermic, by Le Chatelier’s principle, equilibrium will shift in the forward direction with increasing temperature.

(iii) Equilibrium composition will not be disturbed by the presence of catalyst but equilibrium will be attained quickly.

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