1. The problem statement, all variables and given/known data Diagram here: http://img99.imageshack.us/img99/7189/systemgk9.jpg [Broken] Two bulbs, A of volume 100cm3 and B of volume 50cm3 , are connected to a three way tap T which enables them to be filled with gas or evacuated. The volume of the tubes may be neglected. Initially bulb A is filled with an ideal gas at 10oC to a pressure of 3.0 x 105 Pa. Bulb B is filled with an ideal gas at 100oC to a pressure of 1.0 x 105 Pa. The two bulbs are connected with A maintained at 10oC and B at 100oC. Calculate the pressure at equilibrium. 2. Relevant equations PV = nRT 3. The attempt at a solution I have the total Volume, total n but I can't find the final temperature of the system. I'm learning A-level Physics and this problem comes from a book, the Advanced Level Physics by Michael Nelkon. Please help me. Thank you in advance.