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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)]
The equilibrium constant `K_(p)` for the following reaction is `1` at `27^(@)C` and `4` at `47^(@)C.`
`A(g)hArrB(g)+C(g)`
For the reaction calculate enthalpy change for the
`B(g)+C(g)hArrA(g)`
`(Given : R=2cal//mol-K)`

A

`-13.31Kcal//mol`

B

`13.31Kcal//mol`

C

`-19.2Kcal//mol`

D

`-55.63Kcal//mol`

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