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.
You order a 16 oz glass of tea (where the mass of Tea is 474 grams) from a local restaurant. The tea is freshly brewed and has an initial temperature of 21.07 °C. You add ice to cool it. If the heat of fusion of ice is 6.01 kJ/mol and each ice cube contains exactly 1 mol of water (assume the ice does not add anymore volume), calculate the number of ice cubes necessary to cool the tea to 4.70 °C. The specific heat of the "tea" is 4.184 J/g°C. *ice cubes (partial cubes allowed) and ignore the heat required to raise the temperature of the melted ice cubes.
A. 8.93
B. 7.56
C. 4.81
D. 6.04
E. 5.39
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