The values of the standard molar enthalpies of the compounds studied were calculated using the standard enthalpies of formation CO2(g) and H2O(l). The standard enthalpies of formation CO2(g) and H2O(l) were taken as (393.51 ± 0.13) kJ mol1 and (285.830 ± 0.042) kJ mol1 [37]. The procedures for calculation of DcHo m and DfHo m are similar to those given in work [38]. The uncertainties of the standard molar energy and enthalpy of combustion correspond to expanded uncertainties of the mean (0.95 level of confidence) and include the uncertainties in the determinations of calibration constant and the combustion energy of the auxiliary material (cotton thread). The expanded uncertainty of the standard molar enthalpy of formation (0.95 level of confidence) include the contribution from the calibration with benzoic acid, from the combustion of cotton thread as well as the uncertainties of the enthalpies of formation of the reaction products CO2(g) and H2O(l).