Question
What do you mean by the thermochemical equation? How does it differ from the ordinary equation?
Solution
A chemical equation which gives the physical states of both reactants and products along with the amount of heat evolved or absorbed during the process is called thermochemical equation. If heat is evolved during a process, then ∆H (enthalpy change) has a negative value for the process. If heat is absorbed during a process, then ∆H has a positive value for the process. For example
Both (i) and (ii) are thermochemical equations In ordinary equation, the value of ∆H is no mentioned i.e.
Both (i) and (ii) are thermochemical equations In ordinary equation, the value of ∆H is no mentioned i.e.
