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 JJ) is lost when a sample of iron with a mass of 29.0 gg cools from 66.0 ∘C∘C to 29.0 ∘C∘C?
Solution
Use the relationship between heat and temperature change to determine the quantity of heat.
Here, q is the heat; m is the mass of sample, 
is the specific heat capacity of the sample and 
is the change in temperature
.
Mass = 29 g
Specific heat capacity of iron
Temperature change
= (29-66) = -37°c
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