The heat combustion of naphthalene under standard conditions is -5150 kiloJoules per mole or -1230 kilocalories per mole. The experimental specific heat can be measured through the use of a bomb calorimeter.
The heat of combustion is the amount of heat released when one mole of the substance is burned with oxygen. It is commonly referred to as enthalpy and reported in terms of delta H. A combustion reaction is always exothermic, so the delta H value will always be negative. The value is generally reported under standard conditions at a temperature of 298.15 Kelvin and atmospheric pressure constant at one atmosphere.