Variation of equilibrium constant Keq with temperature is given by van’t Hoff equation lnKeq=ΔrS∘R−ΔrH∘RT , from this ΔrH∘ can be evaluated if equilibrium constants K1 and K2 at two temperatures T1 and T2 are known log(K2K1)=ΔrH∘2.303R[1T1−1T2]

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Variation of equilibrium constant $K_{e q}$ with temperature is given by van’t Hoff equation $\ln K_{e q} = \frac{Δ_{r} S^{\circ}}{R} - \frac{Δ_{r} H^{\circ}}{R T}$ , from this $Δ_{r} H^{\circ}$ can be evaluated if equilibrium constants $K_{1} a n d K_{2}$ at two temperatures $T_{1} a n d T_{2}$ are known $\log (\frac{K_{2}}{K_{1}}) = \frac{Δ_{r} H^{\circ}}{2.303 R} [\frac{1}{T_{1}} - \frac{1}{T_{2}}]$

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