Question

which will have more mass 5 mole of sodium or 5 mole of iron

Answer 1

5 mole of fe will have more masss

Answer 2

No of moles =mass/M.wt
m.wt of sodium =23gms
m.wt of iron=56 gms
so 5moles=mass/23
mass of sodium=115gms
5moles=mass/56
mass of iron is 280gms
so mass of iron is more than mass of sodium