TABLE 3.1 Heats of Combustion (ΔHc) of Cycloalkanes Heat of combustion per CH2 group Heat of combustion Number of CH2 groups Cycloalkane kJ/mol kcal/mol kJ/mol kcal/mol Cyclopropane 3 2091 499.8 697 166.6 Cyclobutane 4 2745 656.1 686 164.0 Cyclopentane 5 3320 793.4 664 158.7 Cyclohexane 6 3953 944.7 659 157.5 Cycloheptane 7 4637 1108.4 662 158.3 Cyclooctane 8 5310 1269.2 664 158.7 Cyclononane 9 5981 1429.6 665 158.8 Cyclodecane 10 6639 1586.8 664 158.7 Cycloundecane 11 7293 1743.2 663 158.5 Cyclododecane 12 7922 1893.4 660 157.8 Cyclotetradecane 14 9234 2207.0 660 157.6 Cyclohexadecane 16 10548 2521.0 659 157.6
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We can do this by dividing the heat of combustion (kJ/mol) by the number of CH2 groups. For example, for cyclopropane, the heat of combustion per CH2 group is: $\frac{2091 \text{ kJ/mol}}{3} = 697 \text{ kJ/mol}$ Show more…
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