One of the daily life applications of bomb calorimeter is measuring the calories of the food. One tablespoon of sugar 12.5 g (C6H12O6(s)) is burned in a bomb calorimeter and the temperature of the water is raised from 25 °C to 32 °C. What is the reaction enthalpy (as in kj/mol) and internal energy of the given system? (the heat capacity of the calorimeter is 4.68 KJ/°C). If same amount of sugar was burn in a small engine under 0.95 atm constant pressure at 27o C, what would be the internal energy?
Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
One of the daily life applications of bomb calorimeter is measuring the calories of the food. One tablespoon of sugar 12.5 g (C6H12O6(s)) is burned in a bomb calorimeter and the temperature of the water is raised from 25 °C to 32 °C. What is the reaction enthalpy (as in kj/mol) and internal energy of the given system? (the heat capacity of the calorimeter is 4.68 KJ/°C). If same amount of sugar was burn in a small engine under 0.95 atm constant pressure at 27o C, what would be the internal energy?
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