MUST BE CALCULATED FROM EULER METHOD! A 15% Na2SO4 solution is fed at a rate of 5.5 kg/min into a mixer which initially holds 45.5 kg of a 50-50 mixture of Na2SO4 and water. The exit solution leaves the mixer at a rate of 4.5 kg /min. Assuming uniform mixing, write the two required mass balances (total mass balance and Na2SO4 mass balance) and calculate the weight fraction of Na2SO4 in the mixer at the end of 5 min using Euler Method by taking t= 1 min