It is interesting to compare the “fuel value” of a hydrocarbon
in a hypothetical world where oxygen is not the
combustion agent. The enthalpy of formation of CF41g2 is
-679.9 kJ>mol. Which of the following two reactions is the
CH41g2 + 2 O21g2 ¡ CO21g2 + 2 H2O1g2
CH41g2 + 4 F21g2 ¡ CF41g2 + 4 HF1g2
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