Question

Why are the symbols and formulae of substances important?

Answer 1

Importance of symbols and Formulae:
Symbols and formulae of substance gives a lot of information like. 
1. Types of elements present in the compound. E.g. (H20 is made of two elements hydrogen and oxygen).
2. Number of each kind of atoms in one molecule. E.g. (water has 2 atoms of hydrogen combined with 1 atom of oxygen.)
3. Mass of one molecule of the compound. E.g. [H2O has mass (1 × 2) + 16 = 18 g].