1. How much heat would be needed to boil 285g of H;O? 2. When water freezes, energy is released. How many kJ are released to the surroundings when 150g of water is changed from liquid to solid 3. How much energy would be needed to vaporize 2.8 g of water? 4. How much energy is released with 17g of water is frozen?
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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Phase Change Problems
Heat of Fusion [melting/freezing] (H;O): 6.02 kJ/mol
Heat of Vaporization [and condensation] (H;0): 40.7 kJ/mol
1. How much heat would be needed to boil 285g of H2O?
2. When water freezes, energy is released. How many kJ are released to the surroundings when
150g of water is changed from liquid to solid
3. How much energy would be needed to vaporize 2.8 g of water?
4. How muclh energy is released with 17g of water is frozen?
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