Define chemical formula
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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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a chemival formula is used to denote an element or a compond and also makes chemical equations.
eg: Co2
o2
SO4
H,etc
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