Question

A bomb calorimeter, or a constant volume calorimeter, is a device often used to determine the...

A bomb calorimeter, or a constant volume calorimeter, is a device often used to determine the heat of combustion of fuels and the energy content of foods.


In an experiment, a 1.4170 g sample of L-ascorbic acid (C6H8O6) is burned completely in a bomb calorimeter. The calorimeter is surrounded by 1.354×103 g of water. During the combustion the temperature increases from 24.92 to 27.68 °C. The heat capacity of water is 4.184 J g-1°C-1.

The heat capacity of the calorimeter was determined in a previous experiment to be 890.1 J/°C.

Assuming that no energy is lost to the surroundings, calculate the molar heat of combustion of L-ascorbic acid based on these data.

C6H8O6(s) + 5O2(g)  4 H2O(l) + 6 CO2(g) + Energy

Molar Heat of Combustion = kJ/mol

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