Determining the molecular formula of a compound involves several steps that rely on experimental data and chemical principles. Here's a basic outline of the process:

1. Determine the empirical formula: Start by determining the empirical formula of the compound, which represents the simplest whole number ratio of atoms present in the molecule. This can be done using experimental data such as mass percent composition or elemental analysis.
2. Calculate the empirical formula mass: Calculate the empirical formula mass by summing the atomic masses of all the elements present in the empirical formula.
3. Determine the molar mass of the compound: Obtain the molar mass of the compound experimentally, either through mass spectrometry or other analytical techniques.
4. Calculate the ratio: Divide the molar mass of the compound by the empirical formula mass to determine the ratio between the molecular formula mass and the empirical formula mass.
5. Apply the ratio: Apply the ratio obtained in step 4 to the subscripts in the empirical formula to obtain the molecular formula.
6. Check for whole numbers: Ensure that the subscripts in the molecular formula are whole numbers, as they represent the actual number of atoms in the molecule.

By following these steps, how to find molecular formula of a compound based on experimental data and chemical principles. It's important to note that additional information and techniques may be required for more complex compounds.