II.6 Develop the state model for the batch mixing of two solutions (Figure PII.6). Initially, the tank is empty. The volume of the tank is V (ft3). The flow rates are volumetric and the concentrations are in moles per volume. (a) How long does it take to fill up the tank? (b) Show how would you find the composition and temperature of the mixture in the tank during the time that the tank is being filled up. Assume that the flow rates are volumetric, the compositions in moles per volume, and that the heat of solution depends on the composition. Figure PII.6