Molecular Empirical Formula

Step 1: Assume 100 g of the compound.
Then, mass of each element present is:
C = , H = , Cl = .
Remaining mass corresponds to oxygen.
Step 2: Calculate mass of oxygen.

Step 3: Convert masses into moles.

Step 4: Determine simplest whole-number ratio.
Dividing all mole values by the smallest value (1.55):
C : H : Cl : O = .
Step 5: Conclusion.
The empirical formula of the compound is .