An ice cube with a mass of 20 g at -20 °C (typical freezertemperature) is dropped into a cup that holds 500 mL ofhot water, initially at 83 °C. What is the final temperaturein the cup? The density of liquid water is 1.00 g/mL; thespecific heat capacity of ice is 2.03 J/g-C; the specific heatcapacity of liquid water is 4.184 J/g-C; the enthalpy offusion of water is 6.01 kJ/mol.
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.
An ice cube with a mass of 20 g at -20 °C (typical freezer
temperature) is dropped into a cup that holds 500 mL of
hot water, initially at 83 °C. What is the final temperature
in the cup? The density of liquid water is 1.00 g/mL; the
specific heat capacity of ice is 2.03 J/g-C; the specific heat
capacity of liquid water is 4.184 J/g-C; the enthalpy of
fusion of water is 6.01 kJ/mol.
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