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A steel container, equipped with a piston, contains 21 moles of an ideal gas at 455 K. The container is compressed isothermally to 80% of its original volume. How much work does the gas do? The ideal gas constant, R = 8.314 J/mol.K

An engine manufacturer makes the claim that the engine they have developed will, in one cycle, take 100 J of heat out of boiling water at 100^oC, do mechanical work of 80 J, and exhaust 20 J of heat at 10 ^oC. What, if anything, is wrong with this claim?

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