Determining Formula Mass

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Overview of how to calculate formula mass

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Molecular vs. Formula Mass: 

Molecular vs. Formula Mass Formula Mass - the sum of the atomic masses of all atoms in a compound If the compound is a molecule , then the formula mass is called “molecular mass” As a general rule…use 3 significant figures when calculating with molecular & formula masses.

Example: 

Example Find the formula mass of calcium nitrate, Ca(NO 3 ) 2 1 Ca atom 2 N atoms 6 O atoms 1 x 40.1 = 40.1 u 2 x 14.0 = 28.0 u 6 x 16.0 = 96.0 u + 164.1 u