Isooctane Is a Good Model for Gasoline

question 113

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°C.The calorimeter consisted of two components: a steel vessel with a heat capacity of 1.065 kJ/ °C and 2.00 L of water surrounding it.Assume that the density is water is 1.00 g/mL and that its heat capacity at constant volume is 4.15 J/(g . °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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Definitions:

Double-declining-balance Method

A method of depreciation that accelerates the depreciation of an asset by applying a fixed rate to its declining book value.

Straight-line Method

A depreciation method that allocates the cost of an asset evenly over its useful life, resulting in a constant annual depreciation expense.

Depreciation Expense

The allocation of the cost of a tangible asset over its useful life, reflecting the decrease in the asset's value over time.

Salvage Value

Salvage value is the estimated resale value of an asset at the end of its useful life.