An approach to a study implies a method, that is, how to inquire as well as the focus, that is, what to inquire. There are disagreements among political scientists on the approach to the study of politics. However, we shall confine our discussion to the philosophical and empirical approaches only.
Empirical formula of a substance represents mass of the substance equal to the formula mass of the substance. The formula mass of the substance is equal to the sum of the atomic masses of all the atoms present in the empirical formula.
The molecular formula of a compound is related to its empirical formula as follows: Molecular formula = n × Empirical formula, where, n may be 1, 2, 3 … thus the value of n can be obtained by the following relationship.