Calculate the Molar Mass of MnO2

Answer: The molar mass of Magnesium Dioxide (Mno₂) is 86.9368g /mol.

Number of atoms in Manganese (Mn) =1, Atomic number = 25, Molar Mass= 54.938= Total Mass

Number of Atoms in Oxygen (O) = 2, Atomic number = 8, Molar Mass=15.999, Total Mass=31.998

Therefore, total mass of MnO₂ = 86.9368 g/mol which is also the molecular weight.