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The following equilibrium is established...

The following equilibrium is established during thermal dissociation of `H_(2)O(g)` in a closed vessel:
`H_(2)O(g)hArr H_(2)(g)+(1)/(2)O_(2)(g)`
If the total pressure of the system be P, then find out the relation between equilibrium constant `(K_(p))` and the degree of dissociation of `H_(2)O(g)`.

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