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Internal energy and expanding gas

  1. Sep 24, 2013 #1
    17x10^5 joules are absorbed by an expanding gas that does 8x10^5 joules of work. (a) Find ΔU; (b) Assuming it expands at constant pressure, what's the change in volume?

    Am I correct to use this:

    ΔU = Q - W

    Then after finding ΔU,

    PΔV = Q - ΔU

    Or does this make no sense?
  2. jcsd
  3. Sep 24, 2013 #2
    Both equations are OK. Except the second one is not really required, since you are given W directly.
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