We are interested in solving the mass balance problem shown below (we want to know all flow rates and compositions). Obtain the system of equations to solve. Identify the number of unknowns and the number of equations. All the compositions shown are in weight base. Note1: you DON'T have to solve the system of equations. Note2: Ethanol/water system has an azeotrope, so it is not possible to obtain pure ethanol without implementing strategies like the one shown. ?% ethanol 74.1% benzene 18.5% ethanol C F = 40 kg/h 95% ethanol 7.4% water F =? 5% water Benzene - Ethand A B Jater Flow gle 100% benzene F = ? 10 tal: 40k F 100% ethanol F = ? ?% water F = ? 100% benzene F6= ?