1. The problem statement, all variables and given/known data A 1.00 mol sample of an ideal diatomic gas, originally at 1 atm and 20°C, expands adiabatically to 2.0 times its initial volume. (Assume no molecular vibration.) What is the final pressure for the gas? What is the final temperature for the gas? (it should be near -40 Celcius) I can't find anything relatable besides PV=nRT and something with 5/3? Any help on where to start would be greatly appreciated! Thank you!