Write down a balanced equation for the combustion of 1 mole of C8H18(l). Write a balanced equation for the formation of C8H18 from its elements. By using the information in this problem, determine the heat of formation for 2,3,4-trimethdylpentane. Gasoline is composed primarily of hydrocarbons with eight carbon atoms. These hydrocarbons are called octane. One of the cleanest burning octane is a compound called 2,3,4-trimethylpentane. The complete combustion of 1mol of this compound to CO2(g) and water liquid leads to !H° =-5461 kJ.