(Solved):   Two 1-L beakers, A and B, each containing a different aqueous solution of maltose (a nonvo ...

 

Two 1-L beakers, A and B, each containing a different aqueous solution of maltose (a nonvolatile sugar with MW = 342.30 g/mol) are placed together in a box, which is then sealed. The temperature remains constant at 20 °C. Initially, there is 670 mL of solution in A and 240 mL of solution in B. As the solutions stand in the sealed box, their volumes change slowly for a while. When they stop changing, beaker A contains 470 mL and beaker B contains 440 mL. It is then determined that the solution in A is 1.06 M in maltose and has a density of 1.14 g mL-¹. (a) What is the molar concentration of maltose in the solution in beaker B at the end? M (b) Calculate the concentration of maltose in the solution in A at the start. M (c) Calculate the concentration of the maltose in the solution in B at the start. M (d) The vapor pressure of pure water at 20 °C is 17.5 torr. What is the pressure of water vapor in the box at the end, after the volumes have stopped changing? torr