Air is supplied by a compressor and precooling system to the cooler of a Linde system (Fig 9.6) at 180 bar and 300 K. The low-pressure air leaves the cooler at temperature 6 degrees Celcius lower than the temperature of the incoming high pressure air. The separator operates at 1 bar, and the product is saturated liquid at this pressure. What is the maximum fraction of air entering the cooler that can be liquified?