Subject 1: There is 7.752 moles of helium gas (He) at 151.5ºC in a sealed container. The helium gas is gradually cooled to 59.52ºC, undergoing compression in the process. Subject 2: The molar heat capacity of aluminum is 24.3 J/mol·K. The molar heat capacity of helium gas is 12.7 J/mol·K. The enthalpy of fusion of aluminum is 10.5 kJ/mol. Question: What is the heat transfer between the container and the surroundings as the helium gas undergoes compression and its temperature reaches 49.51ºC?
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.
Subject 1: There is 7.752 moles of helium gas (He) at 151.5ºC in a sealed container. The helium gas is gradually cooled to 59.52ºC, undergoing compression in the process.
Subject 2: The molar heat capacity of aluminum is 24.3 J/mol·K. The molar heat capacity of helium gas is 12.7 J/mol·K. The enthalpy of fusion of aluminum is 10.5 kJ/mol.
Question: What is the heat transfer between the container and the surroundings as the helium gas undergoes compression and its temperature reaches 49.51ºC?
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