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Homework Help: Work under constant temperature

  1. May 6, 2009 #1
    1. The problem statement, all variables and given/known data

    An ideal monatomic gas expands isothermally from 0.590 m3 to 1.25 m3 at a constant temperature of 780 K. If the initial pressure is 1.20x10^5 Pa.
    (a) Find the work done on the gas.
    (b) Find the thermal energy transfer Q.
    (c) Find the change in the internal energy.

    2. Relevant equations
    W= -PV
    PfVf/PiVi = Tf/Ti

    3. The attempt at a solution

    I know I need to find the final pressure...but I'm not sure how to.
    Do I use Pf*1.35/1.2x10^5 = 780k?
  2. jcsd
  3. May 6, 2009 #2

    Andrew Mason

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    Science Advisor
    Homework Helper

    If T is constant and PV=nRT, what is the relationship between P1V1 and P2V2? Does that help you to find P2?

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