It is often argued that natural gas (CH4) is preferred to petroleum (which we will approximate as isooctane, C8H18) in generating energy in that it produces less CO 2. The balanced combustion reactions for CH4 and C8H18 are given below.
CH4(g) + 2O2(g) → CO2(g) + 2H2O(g)
2C8H18(g) + 25O2(g) → 16CO2(g) + 18H2O(g)
Using the following heats of formation, calculate Joules of energy generated per mole of CO2 produced for each combustion. Is methane better than petroleum in lowering CO2 production (in other words, does it produce more CO2 per joules of energy)?
H2O(g) ΔH°f = -241.83 kJ/mol
CO2(g) ΔH°f = -395.51 kJ/mol
CH4(g) ΔH°f = -74.1 kJ/mol
C8H18(g) ΔH°f = -224.1 kJ/mol
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