Imagine that two 1-L beakers, A and B, each containing an aqueous solution of maltose (a nonvolatile sugar with MW = 342.30) are placed together in a box, which is then sealed. (The concentrations of the solutions are not necessarily the same.) The temperature remains constant at 20°C. Initially, there is 260. mL of solution in A and 650. 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 480. mL and beaker B contains 430. mL. It is then determined that the solution in A is 1.54 M in maltose and has a density of 1.20 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. (d) The vapor pressure of pure water at 20°C is 17.5 torr. M What is the pressure of water vapor in the box at the end, after the volumes have stopped changing? torr