Question

calculate the number of atoms in 120g of calcium and 120g of iron. What is the difference between in their number of atoms ?

Answer 1

Number of atoms of calcium

120/40=x/6.022×10^23

X=18.066×10^23

Number of atoms of iron

120/56=y/6.022×10^23

Y=12.9×10^23

Difference is----

(18.066-12.90) ×10^23

=5.166×10^23