I tried but I cannot do it. Please help. Two rigid adiabatic containers have inside the same ideal gas, respectively N1=3mol at a temperature T1=340K and N2=2mol at a temperature T2=280K. The two containers come into contact by opening a faucet, and the gas mixes, getting to a temperature T3. Calculate: 1) the variation of the total internal energy of the gas. 2) the value of the final temperature T3. I really need a hand, if you don't want to solve it please tell me how to do it. Any help is truly appreciated. Pardon the probably incorrect use of words, I'm not english.