The dimerization of ClO in the Antarctic winter stratosphere is believed to play an important part in that region’s severe seasonal depletion of ozone. The following equilibrium constants are based on measurements on the reaction 2ClO(g)→(ClO)₂(g).

(a) Derive the values of Δ_rH^⦵ and Δ_rS^⦵ for this reaction.

(b) Compute the standard enthalpy of formation and the standard molar entropy of (ClO)₂ given Δ_rH^⦵(ClO,g)=+101.8 kJmol⁻¹ and S_m^⦵(ClO,g)=266 6 JK⁻¹ mol⁻¹ .

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T/K 233 258 280 K 4.13x108 5.00x107 1.45x107 5.37×106 3.20×106 9.62×105 T/K 288 K 4.28x105 248 295 1.67x105 303 6.02x104 268 273