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**1. A rigid tank contains .5 kmol of Ar and 2kmol of N2 at 250 kPa and 280 K. The mixture is now heated to 400 K. Determine the volume of the tank and the final pressure of the mixture.**

**2. PV=NRT**

Can you find the initial volume by using PV=NRT?

V=NRT/P

V=(2.5)(8.314)(280)/250=23.2 m^3

Now I am confused how I used this to find V2 and P2, is there another relation between pressure and volume that I don't have? Thanks