When two different liquids are mixed or when a gas or solid is dissolved in a liquid, bonds are broken between neighbouring molecules (or sometimes atom) in the feed materials, and new bonds are formed between neighbouring molecules (or ions) in the product solution.
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.
When two different liquids are mixed or when a gas or solid is dissolved in a liquid, bonds
are broken between neighbouring molecules (or sometimes atom) in the feed materials,
and new bonds are formed between neighbouring molecules (or ions) in the product
solution.
i. Briefly distinguish between heat of solutions and standard heat of formation of solution.
ii. Consider solid X is to be dissolved in solvent Y. If ΔH°f is the heat of formation of X(s),
using the appropriate notations, write an equation to calculate the standard heat of formation of solution that contains 5 mol of X in 100 mol of Y at 25°C, relative to X and Y.
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