Ammonium phosphate, (NH4)3PO4(\text{NH}_4)_3\text{PO}_4(NH4)3PO4, is a highly concentrated salt commonly used in agricultural fertilizers to promote healthy plant growth.
Calculate the percentage by mass of nitrogen in ammonium phosphate.
(Relative atomic masses: H=1.0\text{H} = 1.0H=1.0, N=14.0\text{N} = 14.0N=14.0, O=16.0\text{O} = 16.0O=16.0, P=31.0\text{P} = 31.0P=31.0)