(Solved): \[ q_{\text {intert }}=T_{0} \Delta S \] Entropy Change of Ideal Gases Air is expanded from \( 200 ...

\[ q_{\text {intert }}=T_{0} \Delta S \] Entropy Change of Ideal Gases Air is expanded from \( 2000 \mathrm{kPa} \) and \( 500^{\circ} \mathrm{C} \) to @9 \( \mathrm{kPa} \) and \( 50^{\circ} \mathrm{C} \). Assuming constant specific heats, determine the change in the specific entropy of air \[ \begin{array}{l} s_{2}-s_{1}=c_{\text {pans }} \ln \frac{T_{2}}{T_{1}}-R \ln \frac{P_{2}}{P_{1}} \\ s_{2}-s_{1}=c_{\text {uans }} \ln \frac{T_{2}}{T_{1}}+R \ln \frac{U_{2}}{U_{1}} \end{array} \]