you chop out a 500 g sample of ice out of the Red River when it –40°C outside, then you bring the ice sample indoors where it melts and heats up to 25°C. Assuming that Red River ice is composed of pure water, what is the total energy is absorbed by the ice sample? Water Data Density of water 1.00 g/mL Heat capacity of ice: 2.09 J g–1 K–1 Heat capacity of liquid water: 4.18 J g–1 K–1 Heat capacity of water vapour: 2.01 J g–1 K–1 Enthalpy of fusion: 6.02 kJ mol–1 Enthalpy of vapourization: 40.7 kJ mol–1 Melting point (1 bar): 273 K Boiling point (1 bar): 373 K
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.
bring the ice sample indoors where it melts and heats up to 25°C. Assuming that Red
River ice is composed of pure water, what is the total energy is absorbed by the ice
sample?
Water Data
Density of water 1.00 g/mL
Heat capacity of ice: 2.09 J g–1 K–1
Heat capacity of liquid water: 4.18 J g–1 K–1
Heat capacity of water vapour: 2.01 J g–1 K–1
Enthalpy of fusion: 6.02 kJ mol–1
Enthalpy of vapourization: 40.7 kJ mol–1
Melting point (1 bar): 273 K
Boiling point (1 bar): 373 K
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