Suppose 1.01g of FeCl3 is placed in a 10.0ml volumetric glass, water is added, the mixture is shaken to disolve the solid and then water is added to the calibration mark of the flask. Calculate the molarity of of each ion present in the solution. Please walk me through the steps I\'m trying to help my daughter with her chem. homework and I don\'t know any chem. Solution molarity = mass of the compound FeCl3/ molar mass of FeCl3 *volume of the solution (L) here mass of the compound = 1.01 gms molar mass of FeCl3 = 162.2 gms/mol volume of the solution = 10ml = 0.01L molar mass of FECl3 Â Â = 162.2 gm/mol molarity = 1.01/162.2*0.01 =0.622M.