Nitrogen (N2) has = 25°C, = 1000 cm^3, and P = 1 atm .  Mixed with Oxygen (O2) which has V = 2000 cm^3 and P = 2 atm.  The two are mixed and the volume of the mixture will change at the final temperature and pressure of T = 25°C and P = 1 atm.  Calculate the entropy change for this two-step process.

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