1. 1  an implement, such as a hammer, saw, or spade, that is used by hand. 2  a power-driven instrument; machine tool. ( 3 in combination): a toolkit.
The standard enthalpy of combustion is the enthalpy change when one mole of a reactant completely burns in excess oxygen under standard thermodynamic conditions (although experimental values are usually obtained under different conditions and subsequently adjusted).he standard enthalpy of combustion is the enthalpy change when one mole of a reactant completely burns in excess oxygen under standard thermodynamic conditions (although experimental values are usually obtained under different conditions and subsequently adjusted).
1) Standard molar enthalpy of formation of CO 2 is: (IIT JEE 1997). 1) the standard molar enthalpy of combustion of gaseous carbon. 2) the sum of standard molar enthalpies of formation of CO and O 2. 3) the standard molar enthalpy of combustion of graphite.