4. The dependence of the heat of formation of UPb3 for

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4. The dependence of the heat of formation of UPb3 for the reaction U (solid) + 3Pb (solid) = UPb3 (solid) on temperature in the range from 648 to 1227 K is expressed by the equation ΔНТ = -24.556 + 19.875⋅10 ^ -6T ^ 2-20.356⋅10 ^ -9T ^ 3 kJ. Find the equation of dependence ΔСр = f (T) for this reaction.