Question

which has more number of atoms - 100g of sodium or 100g of iron? Justify your answer.
( atomic mass of sodium = 23u, atomic mass of iron = 56u)

Answer 1

sodium has more number of atoms.
gram atomic mass of sodium=23g
no of atoms in 100g sodium=100/23*6.022*10^23
                                                =2.6*10^24
gram atomic mass of iron=56g
no of atoms in 100g iron=100/56*6.022*10^23
                                          =1.07*10^24

Answer 2

sodium will have more atoms since the no. of atom present in Na is 0.261*10^25 where Fe have 0.107*10^25.