JAMB Chemistry

# The Avogadro number of 24g of Magnesium is the same as that of

a.

1g of hydrogen molecules

b.

16g of oxygen molecules

c.

32g of oxygen molecules

d.

35.5 of chlorine molecules

The molar mass of magnesium is $24 g$. So $24 g$ of Magnesium has $6.02 \times 10^{23}$ magnesium atoms. The oxygen molecule $O_2$ has molar mass $2 \times 16 = 32 g$. So 32 g of oxygen molecules also contains $6.02 \times 10^{23}$ atoms of oxygen molecules.