Two 20.0 g ice cubes at −16.0 ∘C−16.0 ∘C are placed into 255 g255 g of water at 25.0 ∘C.25.0 ∘C. Assuming no energy is transferred to or from the surroundings, calculate the final temperature, Tf,Tf, of the water after all the ice melts. heat capacity of H2O(s)H2O(s) 37.7 J/(mol⋅K)37.7 J/(mol⋅K) heat capacity of H2O(l)H2O(l) 75.3 J/(mol⋅K)75.3 J/(mol⋅K) enthalpy of fusion of H2OH2O 6.01 kJ/mol6.01 kJ/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.
| heat capacity of H2O(s)H2O(s) | 37.7 J/(mol⋅K)37.7 J/(mol⋅K) |
| heat capacity of H2O(l)H2O(l) | 75.3 J/(mol⋅K)75.3 J/(mol⋅K) |
| enthalpy of fusion of H2OH2O | 6.01 kJ/mol6.01 kJ/mol |
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