# What is the molar mass of potassium permanganate?

Are you asking for the molar mass of potassium permanganate, $K M n {O}_{4}$?
$K M n {O}_{4}$, which forms beautiful intensely purple crystals, has a molar mass of $158.03$ $g \cdot m o {l}^{-} 1$. In other words a mass of $158.03 \cdot g$ of potassium permanganate has Avogadro's number of potassium permanganate formula units.
You should know how calculate that figure; it is a fairly trivial exercise that involves adding the molar masses of potassium, manganese, and $4$ $\times$ the molar mass of oxygen.