6. Bomb calorimeters are used to measure the AU of a reaction, which is equal to the heat flow at constant volume, qy. When 1.010 g of sucrose (C12H2201) undergoes combustion in a bomb calorimeter, the temperature rises from 24.92 °C to 28.33 °C. Calculate AUrxn for the combustion of sucrose (in kJ/mol sucrose). The heat capacity, Ceal, of the bomb calorimeter, determined in a separate experiment, is 4.90 kJ/°C. (You can ignore the heat capacity of the small sample of sucrose because it is negligible compared to the heat capacity of the calorimeter.) heat of (water + calorimeter) = qsoln = Ccal AT Hint: think about the heat is flow between the calorimeter + water and the combustion reaction first.
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.
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