Determining the molecular formula of a compound is a crucial step in understanding its chemical composition. How to find molecular formula, follow these steps:

Start with the Empirical Formula: If available, begin with the empirical formula. This represents the simplest whole-number ratio of atoms in a compound. For example, the empirical formula for hydrogen peroxide is HO.

Calculate the Compound's Molar Mass: Find the molar mass of the compound. This can be done by adding up the atomic masses of all the atoms in the empirical formula. For hydrogen peroxide (HO), the molar mass is approximately 34.02 g/mol.

Determine the Molar Mass of the Empirical Formula: Calculate the molar mass of the empirical formula. For HO, it's 17.01 g/mol.

Divide the Compound's Molar Mass by the Empirical Formula's Molar Mass: In the case of hydrogen peroxide, divide 34.02 g/mol by 17.01 g/mol, resulting in approximately 2.

Whole-Number Ratio: If the result from the division is a whole number, then the empirical and molecular formulas are the same. In this case, the molecular formula of hydrogen peroxide is also HO.

For Non-Whole Number Ratios: If the result is not a whole number, multiply the subscripts in the empirical formula by the same factor to obtain the whole-number ratio. For example, if the result were 2.5, the molecular formula would be H2.5O2.5, which can be simplified to H5O5, or HO.

By following these steps, you can determine the molecular formula of a compound, providing a more precise representation of its chemical structure and composition.