A small still is separating propane and butane at 135 C and initially contains 10 kg moles of a mixture whose composition is x=.30(x mole fraction butane)additional mixture(xf=.30)is fed at the rate of 5kg mol/hr.if the total volume of the liquid in the still is constant and the concentration of the vapor from the still xd is related to xs as follows: xd=xs/(1+xs).how long will it take for the value of xs to change from.30 to.40? what is the steady state value of xs in the still(i.e.,when xs becomes constant?)
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