Question

what is chemical formulae? explain​

Answer 1

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The chemical formula of a substance is based on the composition of that substance. It indicates the type and number of atoms of each kind present in that substance.

For example, the chemical formula of water is written as $\sf {H_2O}$.This means that a water molecule is formed by the combination of two atoms of hydrogen and one atom of oxygen.

Similarly, the formula of carbon dioxide is $\sf {CO_2}$. This means that a carbon dioxide molecule is formed by the combination of one atom of carbon dioxide and two atoms of oxygen.

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Answer 2

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The chemical formula of a compound is a symbolic representation of its chemical composition. For example, the chemical formula of water, which is H2O, suggests that two hydrogen atoms combine with one oxygen atom to form one molecule of water.