Abstract
Using a static-bomb combustion calorimeter, the standard (p° = 0.1 MPa) molar enthalpy of combustion at the temperature 298.15 K of 3-nitrophenol was determined: − ΔcH°m(cr)/(kJ·mol−1) = 2870.0±1.5. The vapour pressure of the crystals was measured, as a function of the temperature T, by the Knudsen-effusion technique and the standard molar enthalpy of sublimation at T = 323.13 K was derived by the Clausius-Clapeyron equation: ΔgcrH°m(323.13 K)/(kJ·mol−1) = 98.92±0.58. From this value the standard molar enthalpy of sublimation at T = 298.15 K was calculated as ΔgcrH°m(298.15 K)/(kJ·mol−1) = 100.2±0.6.
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