Answer:
Molar mass
of Ca= 40 g
40 g of Ca contains, number
of atoms
= 6.022 x1023
120 g of Ca contains,
number of atoms
= 18.066 x1023
= 1.8066 x
10 atoms Again molar mass of Fe = 56 g
56 g of Fe contains number
of atoms
= 6.022 x1023
120 g of Fe contains number
of atoms
= 1.2904 x1024
atoms
Therefore,
120 g of calcium has more number of atoms,
Difference =
(1.8066 -1.2904) x 1024
= 5.162 x1023
atoms
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