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X==========Y

they have a pressure of p and same temperature of T

Y is then heated, increasing it's temperature from T to 2T.

what is the final total pressure in terms of p?

I used Dalton's Law, so I assumed that the pressure in each vessel was actually 0.5p. I then used the equation

PfVf = PxVx + PyVy

but I could never get the answer which is 1.33p! ):

Could someone please help? Thank you very much! (: