Question

Calculate the molar mass of MnO₂.

Answer 1

1. Molar mass is the sum of the masses of all the individual atoms present in a molecule or Compound.
2. Manganese dioxide is a brown-black colour compound which is found naturally.
3. Its ore is known as pyrolusite.
4. The chemical formula of manganese dioxide is ${\mathrm{MnO}}_2$.
5. The atomic mass of manganese Mn is 54u.
6. The atomic mass of Oxygen O is 16u.
7. $\mathrm{Molecular}\mathrm{mass}\mathrm{of}{\mathrm{MnO}}_2=(\mathrm{Atomic}\mathrm{mass}\mathrm{of}\mathrm{Manganese})\mathrm{x}1+(\mathrm{Atomic}\mathrm{mass}\mathrm{of}\mathrm{Oxygen})\mathrm{x}2$

$=(54\mathrm{x}1)+(16\mathrm{x}2)$

$=86\mathrm{g}$

The molecular mass of MnO₂ is 86g.