What is the percentage by mass of nitrogen in ammonium phosphate,(NH₄)₃PO₄? A)28.1 % B)14.15 % C)52.4 % D)39.9 % E)2.27 %

Question

Quizplus · Accepted Answer

The molecular formula for ammonium phosphate is (NH4)3PO4. To find the percentage by mass of nitrogen, first calculate the molar mass of the compound: 3*(14.01 for N + 4*1.01 for H) + 30.97 for P + 4*16.00 for O = 149.09 g/mol. The mass of nitrogen in the formula is 3*14.01 = 42.03 g. The percentage by mass of nitrogen is then (42.03 / 149.09) * 100% = 28.2%, which rounds to 28.1%.

What Is the Percentage by Mass of Nitrogen in Ammonium