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Answered 2010-02-05 19:15:47

A molecular mass is found by adding all of the masses of the atoms for that molecule. In NaH2PO4, we have:

Na: 1 atom x 23amu/atom = 23

H: 2 atoms x 1.0 amu/atom = 2

P: 1 atom x 31amu/atom = 31

O: 4 atoms x 16amu/atom = 64

Add those together, and NaH2PO4 has a molecular mass of... 120.

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