A particular natural gas consists, in mole percents, of 83.0 (methane), 11.2 (ethane), and 5.80 (propane). A 385- sample of this gas, measured at25...

A particular natural gas consists, in mole percents, of 83.0  (methane), 11.2 (ethane), and 5.80  (propane). A 385- sample of this gas, measured at25 and 759 , is burned in an excess of oxygen gas.How much heat, in kilojoules, is evolved in this combustion reaction?The table shown here gives the enthalpy of combustion for three different hydrocarbon fuels.Hydrocarbon fuel ()CH4-1559.7 C2H6-2219.1 C3H8