How many moles do you need? That's M x L = 0.1 M x 0.1 L = ?
Then mols = grams/molar mass.
You know mols and molar mass, solve for grams KMnO4.
Then place that many grams KMnO4 in a 100 mL volumetric flask, add some distilled water, swirl until all of the solid is dissolved, add distilled water to the mark of the volumetric flask, mix thoroughly, stopper, label.
NOTE: This doesn't sound like a stock solution to me. A stock solution usually is some larger molarity (such as 1M or something like that) then by dilution you make a 100 mL of 0.1 M from the stock. Stock solutions have an advantage of preparing them and saving for future use; however, KMnO4 solutions are not stable and usually they are made as needed.
How to prepare 0.1 M stock solution of KMnO4 in 100ml?
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