A stock solution is made by dissolving 66. 05 g of (nh4)2so4 in enough water to make 250 ml of solution. a 10. 0 ml sample of this solution is then diluted to 50. 0 ml. given that the molar mass of (nh4)2so4 is 132. 1 g/mol, what is the concentration of the new solution? use m subscript i v subscript i equals m subscript f v subscript f. and molarity equals startfraction moles of solute over liters of solution endfraction. 0. 400 m 1. 60 m 5. 00 m 10. 0 m.