#### Phosphorus pentachloride dissociates as follows in a closed reaction vessel,If total pressure at equilibrium of the reaction mixture is P and degree of dissociation of is x , the partial pressure of will be Option 1) Option 2) Option 3) Option 4)

As we learnt in

Law of Chemical equilibrium -

At a given temperature, the product of concentration of the reaction products raised to the respective stoichiometric coefficient in the balanced chemical equation divided by the product of concentration of the reactants raised to their individual stoichiometric coefficients has a constant value.

- wherein

are equilibrium concentration

and

Relation between pressure and concentration -

- wherein

P is pressure in Pa. C is concentration in mol / litre. T is temperature in kelvin

Given

t = 0            1                     0                    0

teq            1-x                     x                    x

Total number of moles = 1 - x + x + x = 1 + x

Thus partial pressure of

Option 1)

This option is correct

Option 2)

This option is incorrect

Option 3)

This option is incorrect

Option 4)

This option is incorrect