The four unit separation train shown in figure 1.1 has been designed to separate 1000 gmol/hr of a hydrocarbon feed containing 20% CH4, 25 % C2H6, 40 % C3H8, and the rest C4H10 (molar basis) into five fractions. Given the indicated compositions (molar basis) and assuming that the recycle to unit I is 50% of bottoms from unit II (m6 = 0.5 m5), determine`