What Is Formula Mass?

Answer

The formula mass of a molecule or compound is the sum of all the masses of all the atoms that make up the molecule. A molecular mass usually refers to molecules while a formula mass refers to compounds. You can find more information here: http://www.fordhamprep.org/gcurran/sho/sho/lessons/lesson56.htm
1 Additional Answer
To try and predict the mass or mass ratios you have to have an equation or set of equation to get the answers, that is a mass formula. Most physics majors in college use mass formulas in there studies.
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