Octane (C₈H₁₈) Undergoes Combustion According to the Following Thermochemical Equation

question 88

Multiple Choice

Octane (C₈H₁₈) undergoes combustion according to the following thermochemical equation. 2C₈H₁₈(l) + 25O₂(g) → 16CO₂(g) + 18H₂O(l) ΔH°_rxn = -1.0940 × 10⁴ kJ/mol
What is the standard enthalpy of formation of liquid octane?
ΔH°_f(CO₂(g) ) = -393.5 kJ/mol and ΔH°_f(H₂O(l) ) = -285.8 kJ/mol

• A) -250 kJ/mol
• B) -10,940. kJ/mol
• C) -2188 kJ/mol
• D) -495 kJ/mol
• E) 495 kJ/mol

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