Question

3.
If I have 0.5 moles of Magnesium then how many atoms of magnesium is
present?

Answer 1

1 mole of MgO contains Avogadro's number of molecules which is 6.023×10^23

molecules.

0.5 mole of MgO will contain 0.5×6.023×10^23

=3.0115×10^23 molecules