A well-insulated gas cylinder, containing ethylene at 85 bar and 25C, is exhausted until the pressure drops

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A well-insulated gas cylinder, containing ethylene at 85 bar and 25°C, is exhausted until the pressure drops to 10 bar. This process occurs fast enough that no heat transfer occurs between the gas and the cylinder walls, but not so rapidly as to produce large velocity or temperature gradients within the cylinder.

a. Calculate the final temperature of the ethylene in the cylinder. 

b. What fraction of the ethylene remaining in the cylinder is present as a liquid?

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