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gasoline
Course: CHEM 145, Fall 2009School: Widener
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145, Chem Lecture Problems Gasoline H Find out the amount of energy released by the combustion of 1 gallon of gasoline. The balanced reaction is 2 C8H 18 + 25 O2 -> 16 CO2 + 18 H 2O Find H rxn using H formation Hf_C8H18 := 204.8 kJ Hf_O2 := 0 kJ Hf_CO2 := 393.5 kJ Hf_H2O := 241.8 kJ From the balanced reaction find H rxn: Hrxn := 16 Hf_CO2 + 18 Hf_H2O 2 Hf_C8H18 + 25 Hf_O2 Hrxn = 1.024 10 kJ For the...
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145, Chem Lecture Problems Gasoline H
Find out the amount of energy released by the combustion of 1 gallon of gasoline. The balanced reaction is 2 C8H 18 + 25 O2 -> 16 CO2 + 18 H 2O Find H rxn using H formation Hf_C8H18 := 204.8 kJ Hf_O2 := 0 kJ Hf_CO2 := 393.5 kJ Hf_H2O := 241.8 kJ From the balanced reaction find H rxn: Hrxn := 16 Hf_CO2 + 18 Hf_H2O 2 Hf_C8H18 + 25 Hf_O2 Hrxn = 1.024 10 kJ For the combustion of 1 gallon: moles Find of gasoline volume := 1 gal density := 0.7025 gm cm mass := volume density MWC8H18 := ( 8 12.011 + 18 1.0079 ) gm mole moleC8H18 := mass MWC8H18
1 3 4
kJ := 10 J
3
(
) (
)
volume = 3.785 10 cm
3
3
mass = 2.659 kg
moleC8H18 ...
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