Calculate the number of moles present in:

- 3.011 X 10^23 number of oxygen atoms.
- 60 g of calcium

[Given that atomic mass of Ca = 40 u, Avogadro No. = 6.022 X 10^23]

**Answer:**

Calculate the number of moles present in:

- 3.011 X 10^23 number of oxygen atoms.
- 60 g of calcium

[Given that atomic mass of Ca = 40 u, Avogadro No. = 6.022 X 10^23]

**Answer:**