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Chapter 19: Problem 2
Could you heat the kitchen by leaving the oven open? Explain.
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Why doesn't the evolution of human civilization violate the second law of thermodynamics?
The molar specific heat at constant pressure for a certain gas is given by \(C_{p}=a+b T+c T^{2}\), where \(a=33.6 \mathrm{~J} / \mathrm{mol} \cdot \mathrm{K}\), \(b=2.93 \times 10^{-3} \mathrm{~J} / \mathrm{mol} \cdot \mathrm{K}^{2}\), and \(c=2.13 \times 10^{-5} \mathrm{~J} / \mathrm{mol} \cdot \mathrm{K}^{3}\). Find the entropy change when \(2.00\) moles of this gas are heated from \(20.0^{\circ} \mathrm{C}\) to \(200^{\circ} \mathrm{C}\).
In an adiabatic free expansion, \(6.36\) mol of ideal gas at \(305 \mathrm{~K}\) expands 15 -fold in volume. How much energy becomes unavailable to do work?
A box containing 10 coins lying heads up is found to have only 5 coins heads up after shaking. Is there any positive entropy change?
The electrical energy a. is used to run the lightbulb inside the refrigerator. b. wouldn't be necessary if the refrigerator had enough insulation. c. retains its high-quality status after the refrigerator has used it. d. ends up as waste heat rejected to the kitchen environment.
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