The mass per cent of hydrogen is 8.05%
The mass percentage of a solution is defined as the ratio of the mass of solute that is present in a solution, relative to the mass of the solution, as a whole.
The chemical formula of ammonium phosphate is [tex](NH_{4})_{3}HPO_{4}[/tex]
There is 3 X 4=12 Hydrogen atom in one molecule ammonium phosphate.
The total mass of one molecule is [tex](NH_{4})_{3}HPO_{4}[/tex] =149.
The mass of hydrogen atoms in one molecule is 12.
mass % H = [tex]\frac{12X 100}{149}[/tex]
mass % H = 8.05%
Hence, the mass per cent of hydrogen is 8.05%
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