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H2O (g) -> H2(g) + 1/2 O2 (g) Express the equillibrium constant K in terms of...

H2O (g) -> H2(g) + 1/2 O2 (g)

Express the equillibrium constant K in terms of pressure P and degree of dissociation

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Answer #1

H2O (g) -> H2(g) + 1/2 O2 (g)

As the reactants and products both are in gaseous phase, so pressure of all the substrates would be involved in the expression for equilibrium constant

Suppose the pressure initially is P.

Let degree of dissociation be .

So, ICE table is:

PH2O PH2 PO2
Initial P 0 0
Change -P +P +(1/2)P
Equilibrium P(1-) P (1/2)P

Equilibrium constant = K

P gets canceled in numerator and denominator.

This is the final expression for equilibrium constant.

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