In the figure shown below, what streams are represented by point A? By point B? How would you determine the temperature of stage 2? How about the temperature in the reboiler? If feed composition is as shown, how can the liquid composition on the optimum feed stage be so much less than \(\mathrm{z}\) ?

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1.0 YMVC 75- .50- 5. 25 R OB .25 .50 .75 1.0 XMVC