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1 mole of ideal gas at 270C is expanded isothermally from an initial pressure of 3...

1 mole of ideal gas at 270C is expanded isothermally from an initial pressure of 3 atm to afinal pressure of 1 atm in two ways: (a) reversibly and (b) against a constant external pressure of 1 atm. Calculate q, w, ΔU, ΔH and ΔS for each path.

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Answer #1

The temperature is constant in an isothermal process

a)

b) For an isothermal process either reversible or irreversible the internal energy change, delta U is equal to zero (U=0)

c) From the first law of thermodynamics, U=Q+W

Q = -W =

d)

e)

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