Gasoline is composed primarily of hydrocarbons, including many with eight carbon atoms

Chapter 5, Problem 5.75

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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-trirnethylpentane, which has the following structural formula: CH3 CH3 CH3 I I I H3C-CH-CH-CH -CH3 The complete combustion of one mole of this compound to C02(g) and H20(g) leads to !lH0 = -5064.9 kJ/mol. (a) Write a balanced equation for the combustion of 1 mol of CsH!s(l). (b) Write a balanced equation for the formation of C8H18(1) from its elements. (c) By using the information in this problem and data in Table 5.3, calculate llHJ for 2,3,4-trimethylpentane.

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