Isooctane Is a Good Model Compound for Gasoline

question 132

Multiple Choice

Isooctane is a good model compound for gasoline. When 1.14 g of isooctane (114 g/mol) reacts with excess oxygen in a constant pressure calorimeter, the temperature of the calorimeter increases by 10.0^oC. The heat capacity of the calorimeter is 5.46 kJ/^oC. Determine the molar enthalpy of combustion of isooctane.

• A) + 5,460 kJ/mol
• B) +54.6 kJ/mol
• C) -5,460 kJ/mol
• D) -54.6 kJ/mol
• E) -5.46 kJ/mol

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