One mole of ideal gas initially at 300 K is expanded from an initial pressure of 10 atm to a final pressure of 1 atm. Calculate ÎU, q, w, ÎH, and the final temperature T2 for this expansion carried out according to each of the following paths. The heat capacity of an ideal gas is cV=3R/2.

1. A reversible adiabatic expansion.

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Jean KeelingLv2

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Consider 1.50 mol of a monoatomic ideal gas (Cv,m = 3/2R) thatis initially at 390.K (taken as 3 significant figures) and 2.20 atmpressure. For this system, calculate the change in entropy (ÎS),the change in internal energy (ÎU), and the change in enthalpy (ÎH)for a reversible adiabatic expansion of this gas to a finalpressure of 1.10 atm. Also calculate the final temperature (T) andvolume (V).