Question

What is the ratio by mass of the elements present in the chemical formula of magnesium oxide?

Answer 1

• The chemical formula of magnesium hydroxide is $\mathrm{MgO}$
• The molar mass of magnesium($\mathrm{Mg}$)$=24\mathrm{g}$
• The molar mass of oxygen ( $\left(\mathrm{O}\right)$$=16\mathrm{g}$

So, the molar mass of Magnesium and oxygen are 24 and 16 respectively.

Hence, the elements are present in the ratio of 24:16 or 3:2.