Standard Enthalpy Of Formation

molar standard enthalpy of combusion of ethanol is -1320 kJ, malor standard enthalpy of formation of water and CO_(2)(g) are -286 kJ//mole and -393 kJ//mole respectively. Calculate the magnitude of molar standard enthalpy of formation of ethanol.

(i) What do you mean by standard enthalpy of formation? (ii) Is the standard enthalpy of reaction of the following reaction equal to the standard enthalpy off formation of H_(2)O(l) at 25^(@)C:H_(2)(g)+(1)/(3)O_(3)(g)toH_(2)O(l) ? Explain.

At 25^(@)C , in which of the given reactions do standard enthalpies of reactions indicate standard enthalpies of formation of the product in the respective reactions-

From the standard enthalpies of formation values for some compounds (in KJ mol^(-1) ), predict which one of them will be most stable?

Standard molar enthalpy of formation of CO_(2) is equal to :