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Chapter 3: Q21E (page 611)
How many moles are in a 1.00-kg bottle of water? How many molecules? The molar mass of water is 18.0 g/mol.
are present in a 1 kg bottle of water.
No. of molecules present ismolecules.
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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 thermodynamic system undergoes a cyclic process as shown in Fig. Q19.24. The cycle consists of two closed loops: I and II. (a) Over one complete cycle, does the system do positive or negative work? (b) In each loop, is the net work done by the system positive or negative? (c) Over one complete cycle, does heat flow into or out of the system? (d) In each loop, does heat flow into or out of the system? Explain
Is it a violation of the second law of thermodynamics to convert mechanical energy completely into heat? To convert heat completely into work? Explain your answers.
When a wet cloth is hung up in a hot wind in the desert, it is cooled by evaporation to a temperature that may beor so below that of the air. Discuss this process in light of the second law of thermodynamics.
A student asserts that a suitable unit for specific heat is . Is she correct? Why or why not?
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