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Homework Help: Ideal Gas Law (Thermal Physics)

  1. Aug 31, 2008 #1
    guys, i'm having difficulty in solving this problem.

    Two vessels, one having 3 times volume of the other, are connected through narrow tube of negligible volume. The initial temperature is 290K. The small vessel is then cooled down to 250K while the large vessel is heated up to 400K. What is the final pressure?

    Please help me with this. Any pointer will do. Thanks

    I tried to use the equation of state (PV=nRT) of both vessel but I could not get the answer. All i get is the ratio between the final mass of small vessel and the final mass of large vessel.
  2. jcsd
  3. Aug 31, 2008 #2


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    Gold Member

    I don't think that you have sufficient information to solve the problem because no information about the initial pressure is given. Also, I don't believe that the ideal gas law is the correct law to apply in this case, even if you were to be given the initial pressure. I think that application of either the combined gas law or Gay-Lussac's law would be better. Additionally, the two containers are connected so the pressure in each of the containers should be equal (I think). It's been a while since I've done chemistry or thermal physics so maybe someone else will clear this up.
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