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Chapter 3: Q24E (page 641)
Propane gas behaves like an ideal gas with . Determine the molar heat capacity at constant volume and the molar heat capacity at constant pressure.
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Explain why each of the following processes is an example of increasing randomness: mixing hot and cold water; free expansion of a gas; irreversible heat flow; developing heat by mechanical friction. Are entropy increases involved in all of these? Why or why not?
Imagine a special air filter placed in a window of a house. The tiny holes in the filter allow only air molecules moving faster than a certain speed to exit the house, and allow only air molecules moving slower than that speed to enter the house from outside. What effect would this filter have on the temperature inside the house? (It turns out that the second law of thermodynamics鈥攚hich we will discuss in Chapter 20鈥攖ells us that such a wonderful air filter would be impossible to make.)
Section 18.1 states that ordinarily, pressure, volume, and temperature cannot change individually without one affecting the others. Yet when a liquid evaporates, its volume changes, even though its pressure and temperature are constant. Is this inconsistent? Why or why not?
A student asserts that a suitable unit for specific heat is . Is she correct? Why or why not?
If the root-mean-square speed of the atoms of an ideal gas is to be doubled, by what factor must the Kelvin temperature of the gas be increased? Explain.
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