What's the formula mass for (NH4) 3PO4

The formula mass of a molecule is the sum of the atomic weights of the atoms in the empirical formula of the compound. It is also known as Formula Weight.

The atomic weights of

N = 14.01 amu

H = 1.00 amu

P = 30.97 amu

O = 16.0 amu

Now, we will calculate now the formula mass of a given substance

3 (14.01) + 12 (1.00) + 1 (30.97) + 4 (16.0) = 42.03 + 12.00 + 30.97 + 64.0 = 149.0 amu

Therefore, the formula mass for (NH4) 3PO4 is 149.0 amu