Question

7.An atom of some element 'A' weighs 6.644×10 to the power (-23)g. Calculate the number of moles in 4g of it.​

Answer 1

Explanation:

The mass of 6.02×10

23

number of atoms = 6.644××10

−23

×6.02×10

23

= 40 gm /mol (gram atomic mass )

Now the number of gram atoms or moles =

atomicmass

mass(ingm)

=

40

40×10

3

= 10

3