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Old Sep 7th 2017, 03:18 PM   #1
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Airtight pot with water at 200 degrees celcius

New to the forum, so might be posting in the wrong subforum. Not sure this is advanced thermodynamics, but it is a university course so...

Im having some issues with a problem:

You have an airtight pot (closed) with an inner volume of 10L. The pot contains 5kg water (no air is in the pot). The temperature inside the pot is 200 degrees celcius. Determine the fraction of volume inside the pot occupied with liquid water.

Not sure were to begin, im kinda confused. Since critical temperature of water is 374 degrees celcius, and the problem states nothing about pressure. Can Van der Waals equation even be used here?

Any help is appreciated greatly
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Old Sep 7th 2017, 08:13 PM   #2
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You need not worry about critical temp , since this is way above the 200 of the experiment.

You have a closed pot , no air , 5kg of water ... as the temperature rises the pressure will build , and more of the liquid will become gas ... @ 100 the pressure will be one atmosphere ... @ 200 the pressure will be much higher ...from a chart find out the density of the gaseous water @ 200 ... from this you can find out the mass of gaseous water in the container ( don't forget the remaining liquid water is still occupying some of the volume).
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Old Sep 8th 2017, 01:27 AM   #3
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A useful fact to remember is that the mass of 1 litre of water is 1kg
(unless you are looking at extreme pressures, which we are not here).

As oz93666 indicates you need to find the pressure at which the boiling point of water is 200 Celsius.
This will be published in various standard charts which I am sure will be readily available on the internet.
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Old Sep 8th 2017, 11:58 AM   #4
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Hi zwamboo

Hi,

I might be late with this but I ran it out anyway.
(Hope I didn't blow the arithmetic!)

Some other similar problems are here...
Stone Boiling | THERMO Spoken Here!
Grease Fire Experiment | THERMO Spoken Here!

Good luck with your studies! JP
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Old Sep 12th 2017, 08:16 AM   #5
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Thank you very much, helped a lot!
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