Be sure to show correct number of significant figures and unit labels! 1. Calculate the molarity of a solution prepared by dissolving 15.0 g of CaCl2 in enough water to make 250.0 mL of solution. 2. Calculate the mass of KMnO, need to prepare 400.0 mL of a 0.15 M potassium permanganate solution. 3. Calculate the concentration of a solution prepared by adding 16.4 mL of 2.50 M NaBr to a flask and then adding enough water to make 100.0 mL of solution. 4. What volume of 15.0 M HNO, must be diluted with water to prepare 2.50 L of 1.25 M HNO3