this has been solved now

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- Oct 29th 2007, 03:09 AMmarikashelpppp please. nobody can solve it??
this has been solved now

- Oct 29th 2007, 06:15 AMearboth
Hello,

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

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