Question

For the following reaction: CH4(g) + O2(g) --> CO2(g) + H2O (g) A) Using bond enthalpies...

For the following reaction: CH4(g) + O2(g) --> CO2(g) + H2O (g)

A) Using bond enthalpies from reference tables, calculate the enthalpy of this reaction.

B) Is this reaction Endothermic or Exothermic?

(I did this and got 228 kJ, Endothermic however someone previously on Chegg did it and got 500kJ.. our only difference was I broke one more O2 bond after balancing the equation so that I would have enough oxygen molecules for the CO2 as well as the H2O).. Plz help

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Answer #1

Balanced equationis

CH4 + 2 O2 ---> CO2 + 2H2O

dH reaction = Bond energies of bond broken - Bond energies of bond formed

                    = 4 BE (C-H) + 2BE ( O=O) - 2BE ( C=O) - 4 ( O-H)      ( each H2O has 2-OH bonds)

           = 4 ( 413) + 2( 495) - 2( 799) - 4( 463)

    = -808 KJ/mol

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