What is the molar flow of coolant required for the cooling exchanger of a CSTR operating at 88oC if the exchanger has an area of 8.3 m2, total heat transfer coefficient U 324 J / m2soC, coolant has inlet and outlet temperatures of 15 and 35oC and the refrigerant has an average heat capacity of 11 J / mol K? Show the steps. (a) 24.65 mol/s (b) 763.5 mol/s (c) 2489 mol/s (d) 11 mol/s