A system consisting of 2.000 mol of argon expands adiabatically and irreversibly from a volume of 5.000 L and a temperature of 373.15K to a volume of 20.00 L at a constant P_{ext}=1.000 atm. Find the final temperature, assuming that P_{(transferred)}=P_{ext}. Assume argon to be ideal with C_{V}=3nR/2.