Question

Calculate the mass of the 0.5 mole of N atoms (mass from mole of atom)

NCERT Class IX
Sciences - Main Course Book

Chapter 3. Atoms and Molecules

Answer 1

No. of moles =  Mass in gm 
                        Atomic mass

So, 0.5 = Mass in gm
                   14

So, Mass in gm = 0.5 X 14 = 2.8 gm