This is impossible. In order to find this you must know the elements in the compound
the relative molecular mass or molecular weight of a compound is the mass of a molecule of the compound relative to the mass of a carbon atom taken as exactly 12.
If you know the molar mass of the compound, you have to calculate the mass of the empirical formula and divide the molar mass of the compound by the mass of the empirical formula in order to find the ratio between the molecular formula and the empirical formula. Then multiply all the atoms by this ratio to find the molecular formula!
To find the molecular weight (also called the molecular mass or molar mass) of a compound or chemical, you need two things: the molecular formula of the compound and a periodic table. The molecular formula tells you how many atoms of each element is present in the compound. To find the molecular weight, just add up the atomic weights of each element present in the compound, being sure to multiply by the number of times that atom appears. The atomic weight of each element is found on a periodic table.
The molecular mass of a compound with the formula CH2O is approx. 30, not 120.
Molecular mass and formula mass represent the mass of an individual molecule or formula unit of a compound.
The molecular formula mass of this compound is 60.0 amu. The subscripts in the actual molecular formula are 2,4,2.
The molecular formula mass of this compound is 240 amu. The subscripts in the actual molecular formula 8,16,8.
The term formula mass is generally defined as the mass of a unit cell in an ionic compound. Molecular compounds are just defined in terms of molecular mass.
You start with the mass of the compound. This you divide by the total molecular mass of the compound (the atomic mass of 1 molecule) and you multiply this by the amount of atoms 1 molecule consists of.
The molecular mass of a compound is the sum of the chemical elements weights contained in the molecule.