Consider the following water and planetary data: Earth surface temperature: 20.0°C Mars surface temperature: –55°C Boiling point of water on Earth: 100°C Mars surface pressure: 0.011 atm Freezing point of water on Mars: 0.0°C Earth surface pressure: 1.0 atm AHfus(water): 6.02 kJ/mol Cp(ice): 2.03 J/(g-°C) AHvap(water): 44.0 kJ/mol Density (H2O): 1.00 g/mL A. What is the boiling point of water (in K) on the surface of the planet Mars? В. How much heat is required to completely vaporize 1.0 L of Martian surface water (the temperature starts at -55°C)? (HINT: warm the ice, melt the ice, warm the water, and boil the water)
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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