You have two cups of water at temperatures Th and Tc (in Celcius), each of which contains the same mass, m (in kg) of water. When you put them in a freezer, a mass (m, in kg) immediately evaporates off the hot water. Ignore evaporation from the cold water. The specific heat of liquid water is c (in kJ/kg/C), the specific latent heat of vaporization of water is Lv (in kJ/kg), and the specific latent heat of fusion of water is Lf (in kJ/kg). Write a symbolic expression for QC, the amount of heat (in kJ) that must be removed from the cold water in order to lower its temperature to 0°C, and then freeze it. Your expression will involve the variables m, c, Tc, and Lf
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.
The scenario: You have two cups of water at temperatures Th and Tc (in Celcius), each of which contains the same mass, m (in kg) of water. When you put them in a freezer, a mass (m, in kg) immediately evaporates off the hot water. Ignore evaporation from the cold water. The specific heat of liquid water is c (in kJ/kg/C), the specific latent heat of vaporization of water is Lv (in kJ/kg), and the specific latent heat of fusion of water is Lf (in kJ/kg).
Write a symbolic expression for QC, the amount of heat (in kJ) that must be removed from the cold water in order to lower its temperature to 0°C, and then freeze it. Your expression will involve the variables m, c, Tc, and Lf
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