A Sample of Hexane Combustion Calculation

Calculating Heat Production from the Combustion of Hexane

A sample of hexane (C₆H₁₄) has a mass of 0.580 g. The sample is burned in a bomb calorimeter that has a mass of 1.900 kg and a specific heat of 3.21 J/giK. What amount of heat is produced during the combustion of hexane if the temperature of the calorimeter increases by 4.542 K? Use mc017-1.jpg.

Options:

• 8.46 kJ
• 16.1 kJ
• 27.7 kJ
• 47.8 kJ

The answer is 27.7 kJ

Calculation:

According to this equation:
q = M C ΔT

Where:
q = the energy produced when there is a difference in temperature.

M (g) = amount of the material = 1.900 Kg = 1900 g

ΔT = difference in temperature (in kelvin) = 4.542 K

C = Specific heat capacity = 3.21

Therefore,
q = 1900 * 4.542 * 3.21 = 27701.7 J = 27.7 kJ