chemical plant is producing 10,000 kg/h of a product using three different unit operations: a reactor, a distillation column, and a heat exchanger. The reactor produces the product with a 90% yield, the distillation column separates the product from the unreacted feed with a 95% purity, and the heat exchanger cools the product from 150C to 50C using water at 20C. The overall energy efficiency of the plant is 70%. Determine the following: a) The mass flow rate of the feed to the reactor. b) The mass flow rate of the product leaving the distillation column. c) The heat duty of the heat exchanger. d) The overall mass balance of the process. Assume that there are no losses or side reactions in the reactor, and the product and feed have the same density and specific heat.