Explanation: A thermochemical equation is a balanced chemical equation which require an enthalpy change.
A balanced equation is the equation in which number of atoms on reactant side is same as the number of atoms on product side.
A thermochemical equation for [tex]CaCl_2+H_2O[/tex] is:
[tex]CaCl_2+2H_2O\rightarrow Ca(OH)_2+2HCl+heat[/tex]
Here, heat is released in the reaction hence, it is a type of exothermic reaction.
A thermochemical equation for [tex]NH_4NO_3+H_2O[/tex] is:
[tex]NH_4NO_3+heat\overset{water}{\rightarrow} NH_4^++NO_3^-[/tex]
Here, heat is absorbed in the reaction hence,it is a type of endothermic reaction.
