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Calculate the Molar Mass of MnO2

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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.