The answer depends on the compound.
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The chemical formula of the compound shows the ratio of the atoms of elements in a compound. This must not be confused with the ratio of their masses.
A chemical formula gives the number ratio of the different kinds of atoms present in the compound. This means that the ratios are the same if you count in individual atoms, dozens of atoms, or molecules of atoms.
The formula for the compound containing one phosphorus atom and two fluorine atoms, PF2, is PF2. In this compound, phosphorus has a charge of +3 and each fluorine atom has a charge of -1. Therefore, the chemical formula is written as PF2 to indicate the ratio of atoms in the compound.
The ratio of atoms in monosaccharides is 1 carbon: 2 hydrogen: 1 oxygen.
C to O in the ratio 1 : 2.