Molecular Mass

# What is the molecular mass for NaH2PO4?

###### Wiki User

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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the relative molecular mass or molecular weight of a compound is the mass of a molecule of the compound relative to the mass of a carbon atom taken as exactly 12.

16. Carbon has a molecular mass of 12, and hydrogen has a molecular mass of 1. 12 + 4(1) = 16.

The formula is number of moles is mass/ molecular mass. This is also true of no millimoles = milligrams / molecular mass. So You have to multiply by the molecular mass.

By determining the molecular mass, then dividing the molecular mass by the formula mass of the empirical formula to determine by what integer the subscripts in the empirical formula must be multiplied to produce the molecular formula with the experimentally determined molecular mass.

The molecular mass of sodium oxide is 61.97894.