Question

how many grams of mg will have the same number of atoms as 6 gram of c have

Answer 1

6 gms of C = 0.5 moles = N/2 atoms ( N=avagadro number)

N/2 atoms = 0.5 moles of Mg = 12.16 gms

12.16 gms of Mg will have the same number of atoms as 6 gms of C have ( both = N/2 atoms)