Problem: When a 3.80-g sample of liquid octane (C8H18) is burned in a bomb calorimeter, the temperature of the calorimeter rises by 27.1 °C. The heat capacity of the calorimeter, measured in a separate experiment, is 6.21 kJ/°C. Determine ΔE for octane combustion in units of kJ/mol octane.

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FREE Expert Solution

Step 1

Q = CcalTQ = (6.21 kJ°C)(27.1°C)

Q = 168.291 kJ


Step 2

3.80 g C8H8 ×1 mol C8H8104.144 g C8H8 = 0.0365 mol C8H8


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Problem Details

When a 3.80-g sample of liquid octane (C8H18) is burned in a bomb calorimeter, the temperature of the calorimeter rises by 27.1 °C. The heat capacity of the calorimeter, measured in a separate experiment, is 6.21 kJ/°C. Determine ΔE for octane combustion in units of kJ/mol octane.