Adistillation column is used to separate the mixture consisting of 40% ethanol, 35% propanol, 25% butanol. it is planned that the top product does not contain butanol with a composition of 70% ethanol, whereas the bottom product does not contain ethanol (composition not known). % of mass. for feed flow of 5000 kg / hour determined a) degree of freedom of mass balance calculation system b) mass flow rate (kg / jam) products up & down c) bottom product flow composition