10/17/2017 05:00 PM 4 55.8/100 G 10/15/2017 04:47 PM Print Calculator M Periodic

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10/17/2017 05:00 PM 4 55.8/100 G 10/15/2017 04:47 PM Print Calculator M Periodic Table uestion 28 of 30 Sapling Learning r a particular isomer of C8H18, the following reaction produ CeHis(g) consumed, under standard conditions. s 5108.7 kJ of heat per mole of 25 ,n=-5108.7 kJ What is the standard enthalpy of formation of this isomer of CoH(g)? Number kJ / mol Previous Give Up & View Solution 0 Check Answer You will need to look up enthalpy of formation values for O-4g).cog), and H-0(9) utus careers privacy polcy terms of u MacBook Air

Explanation / Answer

From data table:
Hof(O2(g)) = 0.0 KJ/mol
Hof(CO2(g)) = -393.509 KJ/mol
Hof(H2O(g)) = -241.818 KJ/mol


Given:
Ho rxn = 5108.7 KJ/mol
Hof(O2(g)) = 0.0 KJ/mol
Hof(CO2(g)) = -393.509 KJ/mol
Hof(H2O(g)) = -241.818 KJ/mol

Balanced chemical equation is:
C8H18(g) + 25/2 O2(g) ---> 8 CO2(g) + 9 H2O(g)

Ho rxn = 8*Hof(CO2(g)) + 9*Hof(H2O(g)) - 1*Hof( C8H18(g)) - 25*Hof(O2(g))
5108.7 = 8*(-393.509) + 9*(-241.818) - 1*Hof(C8H18(g)) - 25/2*(0.0)
Hof(C8H18(g)) = -10433.134 KJ/mol

Answer: -10433.134 KJ/mol

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