Calculate the heat of reaction for the burning process?
When 2.84 g of ethanol C2H5OH is combusted in a bomb calorimeter, the temperature of the calorimeter increases from 25 °C to 33.73 °C. The heat capacity of the calorimeter is measured to be 9.63 kJ/ °C.
- hcbiochemLv 72 months ago
Heat gained by calorimeter:
q = C (T2-T1)
q = 9.63 kJ/°C (33.73 - 25.00) = 84.07 kJ
So, the combustion released -84.07 kJ
Moles ethanol = 2.84 g / 46.07 g/mol = 0.0616 mol ethanol
Heat of combustion of ethanol = -84.07 kJ / 0.0616 mol = -1.36X10^3 kJ/mol