Calculate δhrxn for the combustion of octane (c8h18) by using average bond energies.

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C8H18(l)+252O2(g)→8CO2(g)+9H2O(g)

Part A

Calculate ΔHrxn for the combustion of octane (C8H18), a
component of gasoline, by using average bond energies.

Express your answer using three significant figures.

ΔHrxn = -5030   kJ/mol  

Part B

Calculate ΔHrxn for the combustion of octane by using
enthalpies of formation from Appendix IIB in the textbook. The
standart enthalpy of formation of C8H18 is -250 kJ/mol.

Express your answer using three significant figures.

ΔHrxn =   kJ/mol  

Part C

What is the percent difference between the two results?

Also Check This  The figure shows a coil made of a wire wrapped around a cylindrical object.?

Express your answer using two significant figures.

  %  

Part D

Which result would you expect to be more accurate?

-the value calculated from the heats of formation
-the value calculated from the average bond energies

Answer

Part A Hn C9) -(g(-39 3.st)+1(mti,e)HE2so.+6] t3! 48.oe-21て6. 387-C-250] 346+250 paite percentaitterereo -50T+.tt6-C-so 30) =


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