what is a chemical formula
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a mathematical relationship or rule expressed in symbols.
a set of chemical symbols showing the elements present in a compound and their relative proportions.
A chemical formula is a way of presenting information about the chemical proportions of atoms that constitute a particular chemical compound or molecule, using chemical element symbols, numbers, and sometimes also other symbols, such as parentheses, dashes, brackets, commas and plus (+) and minus (−) signs.
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