3- pervaporation is used to purify a 95 wt% ethanol in water feed. the operating pressure on the permeate side of the membrane is 25 mm hg. the temperature on the feed side of the membrane is 80 °c. under these conditions the flux of permeate (ethanol + water) is 0.25 kg/m2.h and composition of the of ethanol in permeate is 7.5 wt%.

It is false that during exercise, the oxygen concentration in the blood increases to twice that of resting levels. As a matter of fact, the oxygen either stays the same or decreases, or it may increase slightly than it used to be when the person was resting, but it definitely does not double while exercising. Hope this helps. Let me know if you need additional help!