A distillation column is a process unit in which a feed mixture is separated by multiple vaporizations and condensations to form two or more product streams. The overhead product stream is rich in the most volatile components of the feed mixture (the ones that vaporize most readily), and the bottom product stream is rich in the least volatile components. The following flowchart shows a distillation column with two feed streams and three product streams. How many independent material balances may be written for this system? eTextbook and Media Hint Attempts: unlimited Number of Unknowns How many of the unknown flow rates and/or mole fractions must be specified before the others may be calculated? (See Example 4.3-4. Also, remember what you know about the component mole fractions of a mixture-for example, the relationship between x2A and x2B - m1=1950.0kg/h and x2A=0.550