6. In a CSTR the reaction given below is to be carried out at constant temperature. A+BC+D,rA=0.6CA The concentrations of A nad B in the feed are 1 and 2kmol/m3, respectively. The molar feed rate of a is 150kmol/h. Cost of reactant A:0.1$/kmol, Cost of reactant B: 0.15$/kmol ChE 304 Chemical Engineering Economics Problem Sheet VIII Cost of reactor including installation, auxiliary equipment, instrumentation is 0.1$/m3h. Selling price of C: 0.35$/kmol, Selling price of D: 0.2$/kmol. a. What reactor size and conversion should be used for optimum operation (for maximum annual profit) b. What will be the production rate and unit cost of C for these conditions