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.
How much energy (in kJ) is needed to convert 50.0 g of ice at -10.0 ºC to liquid water at 0.0 ºC?
M=50 gm=0.05kg
we raise the temperature of 0.05kg of ice at -10C to 0C. The heat capacity of ice, Cp = 2.093kJ/kg
ΔH1 = m•Cp•ΔT = 0.05(2.093)(0 – (-10)) = 1.4515 kJ
we need heat to melt the ice at 0C to water at 0C. The heat of fusion of ice, Hf = 333.55kJ/kg
ΔH2 = m•Hf = 0.1kg(333.55kJ/kg) = 33.355kJ
So the total heat energy required is:
ΔH1 + ΔH2 = 1.4515+33.355= 34.8065kJ
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