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Math Help - helpppp please. nobody can solve it??

  1. #1
    marikas
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    helpppp please. nobody can solve it??

    this has been solved now
    Last edited by marikas; November 2nd 2007 at 12:04 PM.
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  2. #2
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    Quote Originally Posted by marikas View Post
    3. The entropy change, ΔS, associated with the isothermal (i.e.
    constant temperature) change in volume of n moles of an ideal

    gas from volume V1 to volume V2 is given by the equation
    ΔS = nR ln(V2/V1)
    where R is the gas constant.
    (a) If a compression occurs (V2 < V1) use Equation 1 to deduce
    whether there will there be an increase (ΔS is positive) or
    decrease (ΔS is negative) in the entropy of the gas.
    Hello,

    \Delta S=n \cdot R \cdot \ln \left(\frac{V_2}{V_1}\right)

    If V_2 < V_1 then \frac{V_2}{V_1} < 1 and then \ln \left(\frac{V_2}{V_1}\right)<0 that means negative and therefore the complete product is negative too. Thus \Delta S is negative so there is a decrease in the entropy of the gas.
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