Question

Calculate the number of molecules in 8 gram of O2

Answer 1

1 g of O2 contains 6.022*10^23molecules

8 g of O2 = 8*6.022*10^23

Answer 2

No of molecules ?

Given mass 8gram

Molecular mass 32

No of moles =Given mass

___________molecular mass

Given mass=8gram.

Molecular mass 32. =0.25

Molecular mass=32