Calculate Δ_fH° of Octane,C₈H₁₈(l),given the Enthalpy of Combustion of Octane

question 116

Multiple Choice

Calculate Δ_fH° of octane,C₈H₁₈(l) ,given the enthalpy of combustion of octane to CO₂(g) and H₂O(l) ,-5471 kJ/mol,and the standard enthalpies of formation of CO₂(g) and H₂O(l) ,-393.5 kJ/mol and -285.8 kJ/mol,respectively.

• A)-249.2 kJ/mol
• B)+4792 kJ/mol
• C)+249.2 kJ/mol
• D)-4792 kJ/mol

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