Formula Mass (Formula Weight)

Author: asim /


The relative formula mass, FM, (formula weight, FW) of a compound is the sum of the atomic masses (atomic weights) of the atomic species as given in the formula of the compound.
Formula Mass (Formula Weight) is a more general term that can be applied to compounds that are not composed of molecules, such as ionic compounds.
In practice, the terms, molecular mass, molecular weight, formula mass and formula weight are used interchangeably by Chemists.

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