for question 1),

i don't think the ans. will change with change in temperature & pressure coz' we are talking of proton which is in the nucleus of atom, so even with change of temperature & pressure, the proton will stay there.

 

now, 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 28g

 

=> 28g of NH3 will have 6.023 * 10²³ molecules

=> 34mg of NH3 will have 6.023 * 10²⁰ * 34 / 28 molecules

 

so, total no. of protons(say p) = 6.023 * 10²⁰ * 34 * 17 /28  = 124.3 * 10²⁰ protons

 

total mass of protons = p * (mass of 1 proton)

 

i think you can do the last part on your own...

 

plz correct me if i'm wrong anywhere....

 

 

 

 

^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.