An equimolal mixture of benzene and toluene is to be separated in a bubble-plate tower at the rate of 100 kg mol/h at 1 atm pressure. The overhead product must contain at least 98 mol % benzene. The feed is saturated liquid. A tower is available containing 24 plates. The feed may be introduced either on the 11th or the 17th plate from the top. The maximum vaporization capacity of the reboiler is 120 kg mol/h. The plates are about 50 percent efficient. How many moles per hour of overhead product can be obtained from this tower?