C8H18(l)+252O2(g)→8CO2(g)+9H2O(g)
1)Calculate ΔHrxn for the combustion of octane (C8H18), a component of gasoline, by using average bond energies.
Express your answer using three significant figures.
2) Calculate ΔHrxn for the combustion of octane by using enthalpies of formation from Appendix IIB in the textbook. The standart enthalpy of formation of C8H18is -250 kJ/mol.
Express your answer using three significant figures.
What is the percent difference between the two results?
Express your answer using two significant figures.