pb(soâ)âthis element is lead (iv) sulfate. lead is a multivalent ion. but we know that sulfate ions, soâ²âť, have a charge of -2. in order to have the ratios match up, we need pbâ´âş (two times as many pbâ´âş than soâ²âť).the molar mass can be calculated by finding the mass of one mole of this compound. consider the following calculation, where amu represents the atomic mass unit. the amu for each atom involved in this compound can be found on a periodic table. molar mass = amu pb + 2(amu s + 4 * amu o)from a periodic table (with masses rounded to the nearest tenth), amu pb = 207.2 g amu s = 32.1 g amu o = 16.0 gtherefore molar mass = 207.2 + 2(32.1 + 4*16.0) = 399.4 gthe molar mass is therefore 399.4 grams per mol