An ideal gas is compressed isothermally to one-third of its initial volume. The

Question

An ideal gas is compressed isothermally to one-third of its initial volume. The resulting pressure will be three times as large as the initial value. less than three times as large as the initial value. more than three times as large as the initial value. equal to the initial value. impossible to predict on the basis of this data. A closed 2.0-L container holds 3.0 mol of an ideal gas. If 200 J of heat is added, and no work is done, what is the change in internal energy of the system? zero 100 J 150 J 200 J 2500 J of heat is added to a system during a process in which 1800 J of work are done on the system. What is the change of internal energy of the system. -700 J 700 J 4000 J 4300 J 5000 J An ideal carnot engine extracts of heat from a high-temperature reservoir at 1200 K during each cycle, and rejects heat to a low-temperature reservoir at 700 K during the same cycle. What is the efficiency of the engine? 0.57 0.35 0.42 0.70

Explanation / Answer

14)

as no work is done

change in internal energy = heat added

change in internal energy = 200 J

15)

heat added = 2500 J

work done on system = 1800 J

change in internal energy = heat added + work done on the system

change in internal energy = 1800 + 2500

change in internal energy = 4300 J

16)

Th = 1200 K

Tc - 700 K

efficiency of engine = 1 - Tc/Th

efficiency of engine = 1 - 700/1200

efficiency of engine = 0.42

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