A benzene-toluene mixture is to be separated in a continuous distillation column. Calculate the number of equilibrium stages and ideal trays and the position of the feed tray when:

The feed contains 44 mol% of benzene and 56 mol% of toluene.

The feed is liquid at its boiling point.

The reflux ratio of 3.5 is to be used.

The distillate should contain 97.4 mol% of benzene.

The bottom product should not contain more than 2.4 mol% of benzene.

The column has a partial reboiler and a total condenser.

Benzene and toluene form a nearly ideal system with a relative volatility about 2.5. (You can draw the equilibrium curve based on this information.)

The feed line is _____? line. The intercept of the upper operating line on the y axis is _____ . (Give the answer with three decimals.)

The number of equilibrium stages is _____ . (Use integers.)

The number of ideal trays is ______ . (Use integers.)

The feed should be introduced on the _____ th tray from the top. (Give the number.)