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Work done PV curves

  1. Sep 13, 2010 #1
    1. The problem statement, all variables and given/known data

    One mole of a dilute gas initially has a pressure equal to 1.00 atm, and a volume equal to 14.0 L. As the gas is slowly heated, the plot of its state on a PV diagram moves in a straight line to the final state. The gas now has a pressure equal to 2.00 atm, and a volume equal to 78.0 L.

    (a) Find the work done by the gas.


    (b) Find the heat absorbed by the gas.

    2. Relevant equations



    3. The attempt at a solution
    I took the area under the PV curve which is a triangle... 64/2*101.325
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Sep 14, 2010 #2

    ehild

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    Watch out: It is not a triangle. The work done by the gas is the area under the PV curve down to P=0.

    ehild
     
  4. Sep 14, 2010 #3

    Andrew Mason

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    In addition to what ehild points out, watch the units for volume. If you are using MKS units you have to convert litres to _________.

    What is the relationship between work done, heat flow and change in internal energy? To find the heat flow, what other quantity do you have to find? (hint: what is the change in temperature?).

    AM
     
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