For a particular isomer of C8H18, the combustion reaction produces 5099.5 kJ of heat per mole...

Question

Question

For a particular isomer of C8H18, the combustion reaction produces 5099.5 kJ of heat per mole of C8H18(g) consumed, under standard conditions.

C8H18 (?) +252O2 (?) ⟶8CO2 (?) +9H2O (?) Δ?∘rxn=−5099.5 kJ/mol

What is the standard enthalpy of formation of this isomer of C8H18(g)?

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Answer 1

Answer #1

Heat of reaction dHrxn = heat of formation of products-heat of formation reactants

given
dHrxn = - 5099.5 KJ/mol
dHfO2 = 0 kj/mol
dHfco2= -393.509 kj/mol
dHfh2o = - 241.818 KJ/mol values taken from standard table

dHrxn = 8[-393.509]+9[-241.818] - 1[dHfC8H18]
dHfC8H18=5099.5 +8[-393.509]+9[-241.818]
dHfC8H18 = - 224.934 Kj/mol

this is enthalpy of formation for C8H18
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Thank you

Answer 2

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