Define chemical formula
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A chemical formula identifies each constituent element by its chemical symbol and indicates the proportionate number of atoms of each element. In empirical formulae, these proportions begin with a key element and then assign numbers of atoms of the other elements in the compound, by ratios to the key element.
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Chemical formual is defined as a formule of molecule in which symbol of Different or same elements are write in proportion of some no or we can say that element are written in formula such that they bear some ratio
Like In Carbon dioxide ratio of carbon to oxygen is 1:2
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