Nitrogen enhances the growth of leaves of plant stems. Calculate the mass fraction of nitrogen

Nitrogen enhances the growth of leaves of plant stems. Calculate the mass fraction of nitrogen in fertilizers: a) ammonium phosphate b) ammonium dihydrogen phosphate

a) Calculate the mass fraction of nitrogen in ammonium phosphate:

w (N) = 3 * Ar (N): Mr ((NH4) 3PO4);

Mr ((NH4) 3PO4) = 14 * 3 + 4 * 3 + 31 + 4 * 16 = 149;

w (N) = 3 * 14: 149 = 0.2819 or 28.19%;

b) calculate the mass fraction of nitrogen in ammonium dihydrogen phosphate:

w (N) = Ar (N): Mr (NH4H2PO4);

Mr (NH4H2PO4) = 14 + 6 + 31 + 4 * 16 = 115;

w (N) = 14: 115 = 0.1217 or 12.17%.

Answer: a) 28.19%; b) 12.17%.