(a) The thermochemical equations are balanced, that is, the equation has the same number of both and different atoms.
(b) The physical states of various substances are displayed in thermochemical equations. Solid, liquid and gaseous substances are represented in brackets with their formulas by s, l, and g respectively.
Aqueous solutions are displayed by writing (aq) in brackets with the formula of the substance. Display the various allotropes by writing the name of the epitope in brackets with their formula.