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Homework Help: What is the change in entropy ΔS of the gas?

  1. Dec 16, 2015 #1
    1. The problem statement, all variables and given/known data
    Two moles of an ideal gas undergo a reversible isothermal expansion from 3.37×10−2m3 to 4.29×10−2m3 at a temperature of 29.6 ∘C.

    What is the change in entropy ΔS of the gas?

    2. Relevant equations

    3. The attempt at a solution

    I don't know how to use this integral. And is it necessary to use this integral here? It seems like it is making the calculation more complicated than it should be. I have no other idea on how to approach this question. Please give me some hints!
  2. jcsd
  3. Dec 16, 2015 #2
    Hint: In the integration, P=nRT/V
  4. Dec 16, 2015 #3
    You're on the right path. Note that the integral should be
    [tex] \int_{V_{1}}^{V_{2}} \frac{PdV}{T} [/tex]
    Manipulate the integrand using the ideal gas equation of state to obtain an expression in terms of the variable of integration (i.e. the volume) and then do the integral.
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