List the following substances in order of energy released by combustion per gram: C₈H₁₈, H₂, C(s), CH₄. (See Study Question 22 for the enthalpy of combustion of isooctane, C₈H₁₈.) Which is the best fuel based on a comparison of kJ/g of fuel?

Data given in Question 22

The enthalpy of combustion of isooctane (C₈H₁₈), one of the many hydrocarbons in gasoline, is 5.45 × 10³ kJ/mol. Calculate the enthalpy change per gram of isooctane and per liter of isooctane (d = 0.688 g/mL).

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isooctane C₂H 18