Problem 2. The feed to a flash drum is 15.0 mole % n-butane, 35.0 mole % n-pentane, 30.0 mole % n-hexane, and the remainder is n-heptane. The feed flow rate is 100 kg moles/day. Use the McWilliams equation instead of the De Priester charts. a. The drum temperature is 75 C, and the drum pressure is 175 kPa (absolute pressure). Find V/F, X, and y. .x b. What is the maximum pressure (in kPa absolute pressure) you could have at 75 C and still have vapor/liquid equilibrium? Report the pressure to 3 significant figures