saplinglearning.com Inverted Lecture #42: CHE 106 H002 Gen Chemistry I Universit

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saplinglearning.com Inverted Lecture #42: CHE 106 H002 Gen Chemistry I University of Southern Mis f Southern Mississippi-CHE 106-Fall17-BROOME Activities and Due Dates HWS 10/17/2017 05:00 PM 72.2/100 o 10/15/2017 04:47 PM Print CalculatorPeriodic Table Question 28 of 30 Sapling Learning For a particular isomer of CsHhs, the following reaction produces 5108.7 kJ of heat per mole of C&H8g;)consumed, under standard conditions ole) sco,W-9H,OR) -> dHns =-5108.7 kJ What is the standard enthalpy of formation of this isomer of CHs(g)? Number 1r. L 10433.131 kJ/mol There is a hint available! botsom divider on the divider bar again to hide the hint Close , O Prevcus Give Up & View Solution Check Answer Next -H E Hint

Explanation / Answer

O2 is in the standrad state
So, its Hof is 0

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

USE:

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)) = -215.734 KJ/mol

Answer: -215.734 KJ/mol

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