Question

Calculate the no. of atoms in 1.2g of calcium

Answer 1

Molar mass of Ca = 40

No. of  atoms in a mole of Ca = No. of moles in 40g of Ca=  Avogadro No = 6.022*10²³ atoms

Number of atoms in 1.2 g of Ca = 1.2*(6.022*10²³/40) = 1.8066*10²² atoms

Ans: 1.2g of Ca 1.8066*10²² atoms

Answer 2

Answer:

1.8066* 10^22

Explanation:

Given Mass      

=                       *Na

Atomic Mass

1.2g

=        6.022*10^23

40g

=0.3 *6.022*10 ^23

=1.8066*10^22