Molar mass of KMnO4= 158.0 g Use this number to convertgrams to moles. moles of KMnO4= 23.7 g KMnO4x (1 mol KMnO4/158 grams KMnO4) moles of KMnO4= 0.15 moles KMnO4 Now the liters of solution is needed. Keep in mind, this is the total volume of the solution, not the volume of solvent used to dissolve the solute.