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Enthalpy Practice Test

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Q1

$C + $O_{2}$\rightarrow $CO_{2}$ \ \ \Delta H_${f}^{0}$ = - 394 kJ$

$8C + $9H_{2}$\rightarrow $C_{8}$ $H_{18}$\ \ \Delta H_${f}^{0}$ = -269 kJ$

Given the enthalpies of formation, what is the enthalpy of combustion of octane in the reaction:

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