Gasoline is composed primarily of hydrocarbons, including many with eight carbon atoms, called octanes. One of the cleanest-burning octanes is a compound called 2,3,4- trimethylpentane, which has the following structural formula:

The complete combustion of one mole of this compound to CO2(g) and H2O(g) leads to ΔH° = - 5064.9 kJ/mol.
(a) Write a balanced equation for the combustion of 1 mol of C8H18(l).
(b) Write a balanced equation for the formation of C8H18(l) from its elements.
(c) By using the information in this problem and data in Table 5.3, calculate ΔH°f for 2,3,4- trimethylpentane.

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СН, СН, СН, Нас-СН-СН-СН-СНз