a) Calculate the molarity of a solution made by dissolving 0.750 grams of Na2SO4 in enough water to form exactly 850mL of solution.
b) How many moles of KMnO4 are present in 250mL 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?