Thermodynamic properties of hydrofullerene C_(60)H_(36) in the range of 5-340 k

摘要

For the first time the method of adiabatic vacuum calorimetry allowed the studies of the temperature dependence of heat capacity, C_p~o, for hydrofullerene C_(60)H_(36) in the 5 - 340 K range within approx 0.2percent error. Experimental data were used inthe calculation of thermodynamic functions for hydrofullerene in the 0 / 340 K range. For T = 298.15 K and p = 101.325 kPa, the value of C_p~o (298.15) is 690.0 J/Kcentre dotmol; H~o(298.15) -H~o(0) = 84.94 kJ/mol; S~o(298.15) = 506.8 J/Kcentre dotmol; G~o(298.15) -H~o(0) = -66.17 kJ/mol. Moreover, the standard values of entropies were calculated for the following reactions in the 0 - 340 K range: 60C(graphite) + 18 H_2(g) ->C_(60)H_(36)(s) [1] C_(60)(s) + 18 H_2 (g) ->C_(60)H_(36)(s) [2] At T = 298.15 K and p =101.325 kPa, triangle openS_f~o = = 2188.4 J/K mol for the reaction [1] and triangle openS_r~o = - 2270.5 J/K mol for the reaction [2].