We simply use the formula below to calculate the heat of combustion per CH_{2}

$\overline{){\mathbf{\u2206}}{\mathbf{H}}{\mathbf{}}{\mathbf{per}}{\mathbf{}}{{\mathbf{CH}}}_{{\mathbf{2}}}{\mathbf{}}{\mathbf{=}}{\mathbf{}}\frac{\mathbf{\u2206}{\mathbf{H}}_{\mathbf{rxn}}}{\mathbf{number}\mathbf{}\mathbf{of}\mathbf{}{\mathbf{CH}}_{\mathbf{2}}}}$

(a) Given the following reactions and their heats of combustion, calculate the heat of combustion per CH_{2} for cyclopropane, cyclobutane, cyclopentane and cyclohexane.

(b) Rank the four cycloalkanes in order of stability from least stable to most stable.

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