(a) Calculate the morality of a solution made by dissolving 0.750 grams of Na2 SO4 in enough water to form exactly 850 mL of solution.
(b) How many moles of KMnO4 are present in 250 mL of a 0.0475 M solution?
(c) How many milliliters of 11.6 M HCl solution are needed to obtain 0.250 mol of HCl?