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Variation of equilibrium constan K with ...

Variation of equilibrium constan K with temperature is given by van't Hoff equation
`InK=(Delta_(r)S^(@))/R-(Delta_(r)H^(@))/(RT)`
for this equation, `(Delta_(r)H^(@))` can be evaluated if equilibrium constans `K_(1)` and `K_(2)` at two temperature `T_(1)` and `T_(2)` are known.
`log(K_(2)/K_(1))=(Delta_(r)H^(@))/(2.303R)[1/T_(1)-1/T_(2)]`
Variation of `log_(10)` K with `1/T` is shown by the following graph in which straight line is at `45^(@)` hence `DeltaH^(@)` is :

A

`-4.606kJ//mol`

B

`-19.147 kJ//mol`

C

`-8.314 kJ//mol`

D

`-10 kJ//mol`

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