For many years drinking water has been cooled in hot climatesby evaporating it from the surfaces of canvas bags orporous clay pots. How many grams of water can be cooledfrom 35 to 20 °C by the evaporation of 60 g of water? (Theheat of vaporization of water in this temperature range is2.4 kJ/g. The specific heat of water is 4.18 J/g-K.)
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.
For many years drinking water has been cooled in hot climates
by evaporating it from the surfaces of canvas bags or
porous clay pots. How many grams of water can be cooled
from 35 to 20 °C by the evaporation of 60 g of water? (The
heat of vaporization of water in this temperature range is
2.4 kJ/g. The specific heat of water is 4.18 J/g-K.)
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