during the beer brewing process the wort (solution containing sugars extracted from grain) is boiled to sterilize and precipitate proteins. This solution is then cooled before adding yeast to allow fermentation. One way to speed the cooling process is to place the brew kettle in ice. How much energy is lost if 1.00 kg of ice (0.0 ̊C) is used to cool the kettle, all the ice melts, and the ending temperature of both the water and kettle have a final temperature of 20. ̊C. The enthalpy of fusion of water is 6.02 kJ/mol. The specific heat of water is 4.184 J/g ̊C.
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.
during the beer brewing process the wort (solution containing sugars extracted from grain) is boiled to sterilize and precipitate proteins. This solution is then cooled before adding yeast to allow fermentation. One way to speed the cooling process is to place the brew kettle in ice. How much energy is lost if 1.00 kg of ice (0.0 ̊C) is used to cool the kettle, all the ice melts, and the ending temperature of both the water and kettle have a final temperature of 20. ̊C. The enthalpy of fusion of water is 6.02 kJ/mol. The specific heat of water is 4.184 J/g ̊C.
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