The upper column of an air-separation system, of the type discussed and shown in Exercise 7.40, contains 48 sieve trays and operates at a nominal pressure of 131.7kPa. A feed at 80 K and 13 1.7kPa enters the top plate at 1,349 lbmol with a composition of 97.868 mol% nitrogen, 0.365 mol% argon, and 1.767 mol% oxygen. A second feed enters tray 12 from the top at 83 K and 131.7kPa at 1,832lbmol/h with a composition of 59.7mol% nitrogen, 1.47mol% argon, and 38.83mol% oxygen. The column has no condenser, but has a split reboiler. Vapor distillate leaves the top plate at 2,487lbmol/h, with remaining products leaving the reboiler as 50 mol% vapor and 50 mol% liquid. Assume that ideal solutions are formed. Determine the effect of percent flooding on the separation and the median Murphree vapor-tray efficiency for oxygen.