Calculate the total energy in kJ required to change the temperature of 238 g water from 19.0 oC to 78.0 oC. Water Physical Property Data Table Heat capacity for ice is 0.00206 kJ/(g oC) Heat capacity for liquid water is 0.00418 kJ/(g oC) Heat capacity for steam (water vapor) is 0.00200 kJ/(g oC) Heat of fusion ( Δ Hfusion) for water in the liquid state is 0.333 kJ/g Heat of vaporization ( Δ Hvap) for water in the gaseous state is 2.26 kJ/g
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.
Calculate the total energy in kJ required to change the temperature of 238 g water from 19.0 oC to 78.0 oC.
Water Physical Property Data Table
Heat capacity for ice is 0.00206 kJ/(g oC)
Heat capacity for liquid water is 0.00418 kJ/(g oC)
Heat capacity for steam (water vapor) is 0.00200 kJ/(g oC)
Heat of fusion ( Δ Hfusion) for water in the liquid state is 0.333 kJ/g
Heat of vaporization ( Δ Hvap) for water in the gaseous state is 2.26 kJ/g
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