The convention we have used for LHV differs from the one offered by the US Department of Energy, which defines LHV as “the amount of heat released by combusting a specified quantity (initially at 25 ^◦C) and returning the temperature of the combustion products to 150 ^◦C, which assumes the latent heat of vaporization of water in the reaction products is not recovered”. According to the DOE convention, the LHV of methane is 789 kJ/mol, compared with 802 kJ/mol from the convention we use in Example 9.2. Account for this difference.