Problem 3. A given mixture is 35 mole% n-hexane (C6) with unknown amounts of n- butane (C4) and n-heptane (C7). Experiments using this mixture in a flash drum at 80 C and 200 kPa resulted in xc7 = 0.5. Find the value of n-heptane in the feed, Zc7, and the value of VIF. Can use the McWilliams equation. An energy balance is not required to solve the