86.4g of KBr is dissolved in 200.mL of water to make a stock solution. 25mL of this stock solution is added to 75mL of water to make a more dilute solution. What is the final molarity of the diluted solution?

Some liquids can be distilled, but only at temperatures that are so high that it is impractical, or so high the compound decomposes. explain why distillation such compounds at significantly less than atmospheric pressure (some degree of vacuum) would solve this problem.