Step 1: Percentage composition of the elements present in the compound.
Step 2: Dividing by the respective atomic weights
Step 3: Dividing the values in step 2 among them by the smallest number.
Step 4: Multiplication by a suitable integer to get whole number ratio.
∴ The simplest ratio of the atoms of different elements in the compound.
C : H : Cl : O = 2 : 3 : 3 : 2
∴ Empirical formula of the compound C2H3Cl3O2.