Two 1-L beakers, A and B, each containing a different aqueous solution of urea (a nonvolatile nonelectrolyte with MW - 60.06 g/mol) are placed together in a box, which is then sealed. The temperature remains constant at 20 °C. Initially, there is 230 mL of solution in A and 730 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 480 mL. It is then determined that the solution in A is 7.81 M in urea and has a density of 1.12 g mL-¹. (a) What is the molar concentration of urea in the solution in beaker B at the end? M (b) Calculate the concentration of urea in the solution in A at the start. M (c) Calculate the concentration of the urea 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? An error has been detected in your answer. Check for typos, miscalculations etc. before submitting your answer. Submit Answer 4 question attempts remaining torr