760c an ideal gas undergoes a process between two

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Unformatted text preview: , obtain Eq. 7–43. 120 L 7–58C What are Pr and υr called? Is their use limited to isentropic processes? Explain. FIGURE P7–49 Determine the final equilibrium temperature and the total entropy change for this process. 7–59C Can the entropy of an ideal gas change during an isothermal process? 7–50 A 12-kg iron block initially at 350°C is quenched in an insulated tank that contains 100 kg of water at 22°C. Assuming the water that vaporizes during the process condenses back in the tank, determine the total entropy change during this process. 7–60C An ideal gas undergoes a process between two specified temperatures, first at constant pressure and then at constant volume. For which case will the ideal gas experience a larger entropy change? Explain. 7–51 A 20-kg aluminum block initially at 200°C is brought into contact with a 20-kg block of iron at 100°C in an insulated enclosure. Determine the final equilibrium temperature and the total entropy change for this process. Answers: 168.4°C,...
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