Two boxes of gas, one helium and one argon are separated by a partition which is

Question

Two boxes of gas, one helium and one argon are separated by a partition which is removed and they are allowed to mix.

Helium V = 2x10-3m3
                P = 106Pa

            T = 300K

Argon    V = 1x10-3m3

             P = 1.5x106Pa

              T = 400K

Calculate the final temperature and pressure of the mixture in equilibrium.

I calculated the number of moles of each gas, 0.801 for helium and 0.451 for Argon, do I just add these together and work with PV = nRT again? But then I have two unknowns.....

Explanation / Answer

Using molar heat capacity of helium and argon find the final temperature. Then using PV=nRT Find the final pressure and yes..just add the no of moles of both ..since after they are mixed they will have same effect on T and P

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