Ethanol: CH3CH2OH (l)-269.29-277.05 ± 0.22: kJ/mol: 46.0684 ± 0.0017: 64-17-5*500 Standard enthalpy of combustion ([latex]\Delta H^\circ _C[/latex]) is the enthalpy change when 1 mole of a substance burns (combines vigorously with oxygen) under standard state conditions; it is sometimes called “heat of combustion.” For example, the enthalpy of combustion of ethanol, −1366.8 kJ/mol, is the amount of heat produced when one mole of ethanol undergoes complete combustion at 25 °C and 1 … [], and was also used for the initial development of high-accuracy ANLn composite electronic structure methods []. The superscript Plimsollon this symbol indicates that the process has o… (b) Use the above information in part (a) and the following data to calculate the standard enthalpy of formation of CO 2 (g). Enthalpy of formation of gas at standard conditions (nominally 298.15 K, 1 atm.) The standard enthalpy of formation or standard heat of formation of a compound is the change of enthalpy during the formation of 1 mole of the substance from its constituent elements, with all substances in their standard states. Standard enthalpy of combustion of ethanol = −1368 kJ mol¯ 1 Standard enthalpy of combustion of hydrogen = −286 kJ mol¯ 1 There is no standard temperature. Its symbol is ΔfH . and the standard enthalpy of formation values: ΔH f o [A] = 433 KJ/mol; ΔH f o [B] = -256 KJ/mol; ΔH f o [C] = 523 KJ/mol; the equation for the standard enthalpy change of formation is as follows: ΔH reaction o = ΔH f o [C] - (ΔH f o [A] + ΔH f o [B]) ΔH reaction o = (1 mol)(523 kJ/mol) - ((1 mol)(433 kJ/mol) + (1 mol)(-256 kJ/mol)\) Go To: Top , References , Notes Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. Write a thermochemical equation which represents the standard enthalpy of formation of ethanol. The standard pressure value p = 10 Pa (= 100 kPa = 1 bar) is recommended by IUPAC, although prior to 1982 the value 1.00 atm (101.325 kPa) was used. 1, 2] enthalpy of formation based on version 1.122 of the Thermochemical Network This version of ATcT results was partially described in Ruscic et al.