The temperature of 1.9 kg of water is 100.0°C, but the water is not boiling, because the external pressure acting on the water surface is 3.0 x 105 Pa. Using the vapor pressure curve for water given in the figure, determine the amount of heat that must be added to the water to bring it to the point where it just begins to boil. Pressure, Pa 4 x 105 3 x 105 2 x 105 1.01 105 0.53 105 0 -50 0 83 100 50 Temperature. C 100 °C 150 1.01 x 105 Pa 83 C 0.53 105 Pa
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.
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