We have a total feed of 100 kg/h to a countercurrent extraction column. the feed is 40 wt % acetic acid and 60 wt % water. we plan to extract the acetic acid with isopropyl ether. the entering isopropyl ether is pure and has a flow rate of 111.2 kg/h. we desire a raffinate that is 20 wt % acetic acid. a) find the acetic acid wt. fraction in the outlet extract stream b) determine the flow rates of the outlet raffinate and extract streams c) find the number of equilibrium contacts