Octane (C8H18) undergoes combustion according to the following thermochemical equation: 2C8H18(l) + 25O2(g) → 16CO2(g) + 18H2O(l), ΔH°rxn = –11,020 kJ/mol. Given that ΔH°f[CO2(g)] = –393.5 kJ/mol and ΔH°f[H2O(l)] = –285.8 kJ/mol, calculate the standard enthalpy of formation of octane.     –11,230 kJ/mol     22,040 kJ/mol     420 kJ/mol     –210 kJ/mol     –420 kJ/mol

Chemistry: The Molecular Science
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Chapter4: Energy And Chemical Reactions
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Octane (C8H18) undergoes combustion according to the following thermochemical equation:
2C8H18(l) + 25O2(g) → 16CO2(g) + 18H2O(l), ΔH°rxn = –11,020 kJ/mol.
Given that ΔH°f[CO2(g)] = –393.5 kJ/mol and ΔH°f[H2O(l)] = –285.8 kJ/mol, calculate the standard enthalpy of formation of octane.

   
–11,230 kJ/mol
   
22,040 kJ/mol
   
420 kJ/mol
   
–210 kJ/mol
   
–420 kJ/mol
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