3-31 No. 1

An insulated, 10 ft3, compartmented tank contains an ideal (but unknown) corrosive gas. The starting conditions are as follows:

                                    Compartment 1                        Compartment 2

               volume                   9 ft3                                 1 ft3
               pressure                 1 atm                                6 atm
                temperature             200°C                             300°C

The thin wall between compartments suddenly dissolves. What is the final pressure, final temperature,  and internal energy change in the tank?

3-31 #1:

To apply the first law of thermo:

1. Define the system (draw a box)
2. Is it open or closed?  (H or U?)
3. Identify which terms apply (dH = Q – W or dU = Q – W)