1000 Question 2: (8 grade) A feed containing 60% air and 40% heptane liquid enters a tank of.liquid hexane at a rate of 6 kg/min. The air leaving the tank contains only about 15% hexane vapor. Air may be considered insoluble in liquids. The density of hexane is 659 kg/m3 and the density of heptane is 684 kg/m3. How much time does it take to vaporize 10 m3 of liquid hexane and fill 15 m3 of liquid heptane