5. A block of aluminum metal weighing 50.0 g was heated to 100.00°C. Then it was immersed in 200 g of water, which was initially at 25.00°C. The final temperature of the overall system was 28.86°C. What is the heat (thermal energy) capacity of aluminum per gram and per mole? Treat the aluminum block as one thermal energy reservoir and the water bath as another. Make a sketch of the essentials of the overall system. One ans: heat capacity = 24.5 J/K mol.
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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