Calculate the molecular mass of potassium permanganate (KMnO4). Atomic masses: K=39.0u,
Mn=55.0u, O=16.0u.
Molecular Mass of KMnO4 = Atomic mass of potassium + atomic mass of manganese + 4 (atomic mass of oxygen)
1(39u) + 1(55u) + 4(16u) = 39u + 55u + 64u = 158u