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For a certain experiment, R-22 vapor is contained in a sealed glass tube at 20C. It is desired to know the pressure at this condition,

For a certain experiment, R-22 vapor is contained in a sealed glass tube at 20°C. It is desired to know the pressure at this condition, but there is no means of measuring it, since the tube is sealed. However, if the tube is cooled to −20°C small droplets of liquid are observed on the glass walls. What is the initial pressure?

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