Using the data in Table 2.3, estimate the heat of combustion of
(a) 2-Methylnonane (in kcal/mol)
(b) Icosane (in kJ/mol)
Sample Solution (a) The last entry for the group of 2-methylalkanes in the table is 2-methylheptane. Its heat of combustion is 1306 kcal/mol. Because 2-methylnonane has two more methylene groups than 2-methylheptane, its heat of combustion is 2 × 156 kcal/mol higher.
Heat of combustion of 2-methylnonane = 1306 + 2(156) = 1618 kcal/mol
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