Two streams flow into a 500.0-gallon tank. the first stream is 10.0 wt% ethanol and 90.0 wt% hexane (mixture density is pi 0.680 g/cm) and the second is 90.0 wt% ethanol, 10.0 wt% hexane (mixture density p2 0.780 g/cm). after the tank has been filled, which takes 22.0 minutes, an analysis of its contents determines that it is 55.0 wt% ethanol and 45.0 wt% hexane. estimate the density of the final mixture and the mass and volumetric flow rates of the two feed streams. mass flow rate of stream 1: kg/min volumetric flow rate of stream 1: u/min mass flow rate of stream 2: kg/min volumetric flow rate of stream 2: u/min density of mixure: g/cm3