1. The Energy Content of Fuels How heat is derived from fuels? For example, we may consider the burning process for heptane C7H16, colorless liquid constituent of gasoline CH16+1102→7CO2+8H2O+1.15×10° calories per100gCnH Carbon dioxide and water are the only material products of the reaction, and the energy liberated is in the form of heat The number at the right in the formula is the heat of combustion for heptane. Every fuel has a tabulated value for this quantity The heat of combustion is the definite maximum amount of energy available from a fuel which cannot be exceededHow heat is derived from fuels? For example, we may consider the burning process for heptane, C7H16, colorless liquid constituent of gasoline. C7H16 + 11O2 → 7CO2 + 8H2O + 1.15x106 calories per 100g C7H16 Carbon dioxide and water are the only material products of the reaction, and the energy liberated is in the form of heat. The number at the right in the formula is the heat of combustion for heptane. Every fuel has a tabulated value for this quantity. The heat of combustion is the definite maximum amount of energy available from a fuel, which cannot be exceeded. 1. The Energy Content of Fuels