4) The table below contains thermodynamic values for water (H20) and for methane (CHA). Water Methane Cs, solid Cs, liquid Cs, gas AH vaporization | AH fusion 2.01 J/g°C 4.18 J/g°C 2.09 J/°C 2,260 J/g 333 J/g Not known 1.64 J/g°C 1.11 J/g°C 255 J/g 34.3 J/g a. Considering water, why is the enthalpy of vaporization higher than the enthalpy of fusion? b. Why is the enthalpy of vaporization much higher for water than for methane? c. Use the values in the table to below determine how much heat is needed to heat 100 g of water that starts at room temperature, 21.5 °C to 115 °C. Show
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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