CHEMICAL ENGINEERING APPLICATION 1. Benzene (1), toluene (2), styrene (3) and xylene (4) are to be separated in a sequence of distillation columns as shown in the figure below. Determine the molar flow rates of streams D1, B1, D2, B2. The composition of the feed stream and the streams of D1, B1, D2, B2 is shown in the figure. Also determine the flow rates and compositions of streams B and D. The molar flow rate of the feed stream is 70mol/min Note: Start with the material balance and write the resulting equations in the form of an augmented matrix. Then use an appropriate method to solve the system of linear equations