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Me again! (ideal gas/free expansion) need help soon

  1. Dec 5, 2004 #1
    Here's my problem:
    An ideal gas is allowed to expand freely into an evacuated chamber.
    The gas is at a pressure of 5 bar and a temperature of 45 degrees Celsius.
    Find the final temperature and pressure of the gas.
    Find the entropy produced.

    W=0, Q=0, dU=0, and dT=0. So the final temp. is 45 degrees Celsius.
    I need pressure at final state though...
    dU=0 implies that u1=u2. But I don't know what the gas is, so I can't get values for these.

    Am I missing something obvious?

    Please help soon!
  2. jcsd
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