25. Carbon tetrachloride is to be removed from a polymer solution by bubbling dry air through it at 297 K. The resulting mixture has % relative humidity of 70. It is required to remove 90% of carbon tetra chloride present by cooling to 283 K, and compressing to a suitable pressure. What this pressure should be? Data : Vapor pressure of CCl4 at 297 K= 12.2 kN/m2 and at 283 K= 6 kN/m2.