Chapter 12.17, Problem 18P

Both cyclooctatetraene and styrene have the molecular formula ${\text{C}}_8{\text{H}}_8$ and undergo combustionaccording to the equation

${\text{C}}_{\text{8}}{\text{H}}_{\text{8}}\text{+}{\text{10O}}_{\text{2}}\to {\text{8CO}}_{\text{2}}\text{+}{\text{4H}}_{\text{2}}\text{O}$

The measured heats of combustion are $4393$ and $4543$ kJ/mol ( $1050$ and $1086$ kcal/mol). Whichheat of combustion belongs to which compound?