Standard molar enthalpy of formation, vapour pressures, and standard molar enthalpy of sublimation of benzanthrone

The standard (po= 0.1 MPa) molar enthalpy of combustion atT= 298.15 K of crystalline benzanthrone was determined asΔcHmo=−(8114.7 ± 2.0)kJ · mol−1by static-bomb calorimetry, and the standard molar enthalpy of formation of the crystal atT= 298.15 K was derived asΔfHmo(cr) =−(4.1 ± 3.0)kJ · mol−1. Vapour pressure as a function of temperature was measured using the mass-loss Knudsen effusion technique, from which the standard molar enthalpy of sublimation atT= 298.15 K was derived asΔcrgHmo= (126.6 ± 0.6)kJ · mol−1. The standard molar enthalpy of sublimation atT= 298.15 K was also measured by the quartz oscillator method,ΔcrgHmo= (129.7 ± 2.1)kJ · mol−1.