Consider benzene in the gas phase, C6H6(g)Use the heat of formation, ΔH∘f , values below to answer the questions.

Substance H(g) C(g) C6H6(g) ΔH∘f (kJ/mol ) 217.94 718.4 82.9

Part A

What is the standard enthalpy change for the reaction that represents breaking all the bonds in gaseous benzene, C6H6(g) ?

Express your answer to one decimal place and include the appropriate units.

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Part B

What is the chemical equation for the reaction that corresponds to breaking just the carbon-carbon bonds in gaseous benzene, C6H6(g) ? Indicate the phase of each species in your answer.

Express your answer as a chemical equation including phases.