When a 4.26 g sample of liquid octane (C8H18) is burned in a bomb calorimeter, the temperature of the calorimeter rises by 26.7 °C. The heat capacity of the calorimeter, measured in a separate experiment, is 6.22 kJ/•C. The calorimeter also contains 3.00 kg of water, specific heat capacity of 4.18 J/g°C. Determine the heat of combustion of octane in units of kJ/mol octane.
When a 4.26 g sample of liquid octane (C8H18) is burned in a bomb calorimeter, the temperature of the calorimeter rises by 26.7 °C. The heat capacity of the calorimeter, measured in a separate experiment, is 6.22 kJ/•C. The calorimeter also contains 3.00 kg of water, specific heat capacity of 4.18 J/g°C. Determine the heat of combustion of octane in units of kJ/mol octane.
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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Transcribed Image Text:When a 4.26 g sample of liquid octane (C3H18) is burned in a bomb calorimeter, the temperature of
the calorimeter rises by 26.7 °C. The heat capacity of the calorimeter, measured in a separate
experiment, is 6.22 kJ/•C. The calorimeter also contains 3.00 kg of water, specific heat capacity of
4.18 J/g°C. Determine the heat of combustion of octane in units of kJ/mol octane.
Enter your answer numerically and in terms of kJ/mol.
Expert Solution
Step 1
Given : Mass of octane reacted = 4.26 g
Change in temperature of calorimeter and water = 26.7 oC
Heat capacity of calorimeter = 6.22 KJ/oC
And mass of water = 3.00 Kg = 3000 g
Molar mass of C8H18 = Atomic mass of C X 8 + Atomic mass of H X 18 = 12 X 8 + 1 X 18 = 114 g/mol.
Since mass = moles X molar mass
=> 4.26 = moles of C8H18 reacted X 114
=> Moles of C8H18 reacted = 0.0373684 mol approx.
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