Write the formulae for the following.
Calcium chloride

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Solution

A chemical formula is a representation of a substance's molecular composition in terms of the symbols for the elements that make up the molecule.
Calcium chloride is a compound containing Calcium as cation and Chlorine as anion with symbols and valencies $Ca and Cl - + 2 and - 1 .$
By the criss-cross method, $Ca Cl + 2 - 1 {CaCl}_{2}$ .
The chemical formula of Calcium chloride is ${CaCl}_{2}$ .

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