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For the reaction below, the enthalpy of reaction is ΔrH° = 29.36 kJ mol−1 and the thermodynamic equilibrium constant is K = 2.17 at 298.15 K.

Cl2(g) + Br2(l) ⟶ 2 BrCl(g)

What is the value of K at 476 K ?

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Use the van't Hoff equation.
The Van't Hoff equation, ln(K2/K1) = ΔHo/R (1/T1 - 1/T2)
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