The figure below shows a hot gas stream at 500 C being cooled to 300 C by transferring heat to the liquid water that enters at 20 C and exits at 218 C. Assume that the heat exchanger is insulated. Calculate the mass flow rate of water that is needed to achieve this cooling of the hot gas stream. Water (20'C) Hot gas (500 C) 100 kg mol Cool gas (300'C) mol fr out co, 02 N 01 CH 03 Water CH, vo o'H 1.0