15.64 mol of gas is in a cylinder fitted with a piston. the gas has molar heat capacity of 21.45 J mol^-1K^-1. the initial volume of the gas is 13.49 L. the external pressure is 2.534 bar. the temperature of the gas increased from 12.44 degrees C to 65.79 degrees C and at the same time the volume of the gas increases to 84.12 L. calculate the internal energy change and enthalpy change of the gas.
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.
15.64 mol of gas is in a cylinder fitted with a piston. the gas has molar heat capacity of 21.45 J mol^-1K^-1. the initial volume of the gas is 13.49 L. the external pressure is 2.534 bar. the temperature of the gas increased from 12.44 degrees C to 65.79 degrees C and at the same time the volume of the gas increases to 84.12 L. calculate the internal energy change and enthalpy change of the gas.
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