Fri May 30, 2008 By:

Formula mass

Expert Reply
Wed June 11, 2008

Finding the formula mass of an ionic compound is just as easy, in fact, the calculation is exactly the same.   The only difference has to do with terminology.  We don't call ionic compounds molecules, so you can't find the molecular mass of an ionic compound.  Instead, we do the exact same calculation, but we call the results the formula mass of the compound.  The table below shows how to calculate the formula mass of two ionic compounds.

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