What information does provide a chemical equation.

Explanation

1) A chemical equation gives information about the reactants and products through their symbols and formulae.
2) It gives the ratio of molecules of reactants and products.
3) As molecular masses are expressed in ''Unified'' masses (U), the relative masses of reactants and products are known from the equation.
4) If masses are expressed in grams, then the equation also gives the molar ratios of reactants and products.
5) If gases are involved, we can equate their masses to their volumes and calculate the volumes of those gases liberated at given condition of temperature and pressure using molar mass and molr volume relationship.
6) Using molar mass and Avogadro's number we can calculate the number of molecules and atoms of different substances from the equation.
7) It gives information about relative masses of reactants and products.
8) From the equation we can get,
a. mass - mass relationship
b. mass - volume relationship
c. volume - volume relationship
d. mass - volume - number of molecules relationship etc.