For a certain experiment r-140a vapor is contained in a, Ask an Expert

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For a certain experiment, R-140a vapor is contained in a sealed glass tube at 20 degrees celcius. We want 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 degrees celcius, small droplets of liquid are observed on the glass walls. What is the initial pressure?

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