^g1)

 

1 molecule of NH3 has 1 proton each of 3 Hydrogen & 14 proton of 1 Nitrogen, so, total protons  = 17 per molecule

 

1 mole NH₃ is 17g.

We have 0.002 moles , i.e. ,therefore we have 6.022 x 10²³ x 0.002=12.044 x 10²⁰ molecules.

And  no. of protons=12.044 x 10²⁰ x 17

Mass of protons= 12.044 x 10²⁰ x 17 x 1.66 x 10^-24 g  {Becoz mass of a proton=1.66 x 10^-24 } 

 

which gives 0.034 g.

Plz rate me if correct.