## Chemistry and Chemical Reactivity (9th Edition)

Bonds broken: 2 OO with b.o. 1.5 Bonds formed: 2 O=O $\Delta H=(2×x)-(2×498)=-392\ kJ/mol$ Solving for x: $H_{OO_{1.5}}= 302\ kJ/mol$. The O-O bond has a dissociation energy of 146 kJ/mol and the O=O, 498. This dissociation energy is approximately halfway between the two.