Answer:
9 Moles of Hydrogen atoms
Explanation:
In order to answer this question, we can use the analogy of a motor car.
One car contains 1 steering wheel, 2 headlights and 4 tyres.
Similarly, 1 mole of [tex](NH_{4} )_{2} HPO_{4}[/tex] contains 9 moles of hydrogen atoms. One mole points to 6.02 [tex]X 10^{23}[/tex] number of particles.
WORKING:
In [tex](NH_{4} )_{2} HPO_{4}[/tex], there are 4x2 = 8 Hydrogen atoms in [tex](NH_{4} )_{2}[/tex] and 1 Hydrogen atom in [tex]HPO_{4}[/tex]. Therefore, there are 8+1= 9 moles of Hydrogen atoms.
