surface). You can assume that the glacier is composed of 100% water. Useful information: Cs (solid water) = 2.09 J/g°C Cs (liquid water) = 4.18 J/g°C Cs (gaseous water) = 2.01 J/g°C ΔHfusion (water) = 6.02 kJ/mol ΔHvap (water) = 40.7 kJ/mol ΔH=______kJ Part 2 Is this process exothermic or endothermic? Describe the heat transfer process that occurs.
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.
Part 1. Calculate the enthalpy change associated with 267 gigatonnes (2.67x105 kg) of a solid glacier at -5 °C melting to a liquid at 17 °C (average temperature of ocean water near the surface). You can assume that the glacier is composed of 100% water.
Useful information:
Cs (solid water) = 2.09 J/g°C
Cs (liquid water) = 4.18 J/g°C
Cs (gaseous water) = 2.01 J/g°C
ΔHfusion (water) = 6.02 kJ/mol
ΔHvap (water) = 40.7 kJ/mol
ΔH=______kJ
Part 2
- Is this process exothermic or endothermic? Describe the heat transfer process that occurs.
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