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3. During an adiabatic expansion the temperature of 0.450 moles of Ar drops from 50.0C to 10.0C. The argon may be treated as an

3. During an adiabatic expansion the temperature of 0.450 moles of Ar drops from 50.0C to 10.0C. The argon may be treated as an ideal gas. (a) How much is the work by the gas? (b) What is the change in the internal energy of the gas?

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