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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 structural formula shown in the figure (Figure 1) . The complete combustion of one mole of this compound to CO2(g) and H2O(g) leads to ΔH∘ = -5064.9 kJ/mol.

By using the information in this problem and data given below, calculate ΔH∘f for 2,3,4-trimethylpentane enter image description here