posted by kelly .
you have two beakers one filled to the 100 ml mark with sugar and the other filled to the 100 ml mark with water. you pour the sugar and all the water together in a bigger beaker and stir until all the sugar is compeletely dissovlved. what happens to the mass of the solution?
mass sugar + mass water = total mass assuming no water is lost to evaporation. The volume, however, (although you didn't ask about that) probably will be more than 100 mL.