a. Calculate the heat required to melt 7.64 g of benzerie at jts normal melting point. Heat of fusion (benzene) = 9.92 kJ/mol Heat = 9.7 b. Calculate the heat reguired to vaporize 7.64 g of benzene at its normal boiling point. Heat of vaporization (benzene) = 30.7 kJ/mol Heat = 2.76 C. Why is the heat of vaporization more than three times the heat of fusion? O In the liquid state, intermolecular forces must be broken, while in the solid state intramolecular forces must be broken. O More energy is required to overcome the forces holding the molecules together in the liquid state (/ to g) than to just allow the molecules to begin moving (s to ). O Forces holding molecules in the liquid state are much stronger than in the solid state.
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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