Isooctane Is a Good Model for Gasoline $\degree$ CThe Calorimeter Consisted of Two Components: a Steel Vessel with Isooctane

question 97

Multiple Choice

Isooctane is a good model for gasoline.When 1.14 g of isooctane C₈H₁₈, molar mass = 114 g/mol) reacted with excess oxygen in a constant volume calorimeter, the temperature of the calorimeter increased by 5.83 $\degree$ C.The calorimeter consisted of two components: a steel vessel with a heat capacity of 1.065 kJ/ $\degree$ C and 2.00 L of water surrounding it.Assume that the density of water is 1.00 g/mL and that its heat capacity at constant volume is 4.15 J/(g . $\degree$ C) , respectively.Use these data to determine the molar enthalpy of combustion of isooctane.

• A)(-5.83 kJ)
• B)(-54.6 kJ)
• C)(-5460 kJ)
• D)(-48,800 J)
• E)(-48,800 kJ)

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