5.1 Historical Background of Thermochemistry Concepts
Thermochemistry is a branch of thermodynamic. The word thermodynamics came from the Greek who gave the thermodynamics word a meaning of heat power. Thermodynamics applications are around us in science and engineering in particular.
The thermodynamics concepts were developed in the period of 17th century (around 1780) by two French men, one of whom was a chemist (Antoine Laurent Lavoisier) and the other was a mathematician (Pierre Simon de Laplace). Both had realized experimentally that the heat produced in a forward reaction chemical reaction was absorbed by the reverse chemical reaction.
Example: N2(g) + 3 H2 ↔ 2 NH3(g) + heat
The chemical equilibrium above is called a system which also include everything belongs to this chemical equilibrium such as reaction container amount of reactants and products. Anything outside this system is called the surrounding. Both the system (chemical reaction) and the surrounding make the universe around us.
The concepts of thermochemistry is given in a video introduction: