What is the percentage of phosphorus in ammonium phosphate?

Answer 1

1.) Find Ammonium phosphate's formula: (NH4)3PO4.

2.) Find the molar mass. (the sum of all the atomic masses)

N's mm = 14 (but there's 3 in the molecule, so *3) = 42

H's mm= 1 (*12) = 12

P's mm: 31

O's mm: 16 (*4) = 64

42 + 12 + 31 +64 = 149 grams.

3.) Use Stoichiometry (or data analysis) to find percentage of phosphorus.

Percent = part/whole.

We already found out that P's mm is 31 grams. (that's the part.)

And we've already found out that the whole thing is 149 grams. (that's the whole.)

So... 31/149 = .20805

3.) multiply by 100 to get the percent:

.20805 * 100 = 20.805 or approx. 21%

Answer 2

Ammonium phosphate typically contains around 61% phosphorus.