Question

number of atoms in 4.25 gram of NH3 is approx

Answer 1

weight of 1 mole of NH3 =17 gms.so it means 4.25 gms is 0.25 moles . if one mole has 6.023×10^23 molecules then 0.25 moles will have 1.50575 ×10^23 molecules. hence no of atoms are 1.50575 ×4×10^23 so it has 6.023 ×10^23 atoms(please mark it as brainliest answer).

Answer 2

Molar mass of ammonia is 14 +3 =17g
17g NH3 contain atom=6*10^23
1g NH3 will contain atom= 6*10^23/17
Therefore , 4.25g NH3 will contain=(4.25*6*10^23)/17=1.5*10^23 atom approx.