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.
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Its chemical formula.
The ratio depends on the compound.
They are called "formulas" (Latin formulae) and show what elements and ions are in the compound. The formula H2O for water shows that a water molecule is made of two atoms of hydrogen and one of oxygen.The symbols representing chemical compounds are called chemical formulas. They can be expressed as an empirical formulawhich shows the simplest ratio of atoms in the compound, or a molecular formula which shows the actual number of each atom in the compound, or as a structural formula which shows the spatial relationship of the atoms.
The answer depends on the compound.
Proust's law of constant proportions states that a given chemical compound always contains its component elements in fixed ratio (by weight). The ratio does not depend on its source and method of preparation.