The standard enthalpy of formation of the metallocene bis (benzene) chromium was measured in a calorimeter. It was found for the reaction Cr (C6H6)2(s) →Cr(s) + 2 C6H6 (g) that ∆Uo (583 K) = +8.0 kJ mol-1. Find the corresponding reaction enthalpy and estimate the standard enthalpy of formation of the compound at 583 K. The constant-pressure molar heat capacity of benzene is 136.1 J K-1 mol-1 in its liquid range and 81.67 J K-I mol-1 as a gas.