Question

which has more number of atoms 50 gram of copper or 50 gram of iron

Answer 1

no of atoms in copper=50÷63.5×N
no of atoms in iron=50÷56.5×N
so iron has more no of atoms
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Answer 2

Atomic mass of Al = 27 u

     So 27 gms of Aluminum contains N = 6.022*10²³ atoms

          50 gms of Al contains :  50 N/27  atoms

Atomic mass of Fe =  56 u

     So 56 gms of Fe contains  N  atoms

          50 gms of Fe contains   50N/56  atoms

Clearly  Aluminum has more number of atoms.  This is because Aluminum has a smaller atomic mass and is lighter.