Two thermally insulated vessel 1 and 2 a...

Two thermally insulated vessel 1 and 2 are filled with air at temperature `(T_1T_2), volume (V_1V_2)` and pressure `(P_1P_2)` respectively. If the valve joining the two vessels is opened, the temperature inside the vessel at equilibrium will be

`T_1+T_2`

`((T_1+T_2))/2`

`(T_1T_2(P_1V_1+P_2V_2))/(P_1V_1T_2+P_2V_2T_1)`

`T_1T_2(P_1V_1+P_2V_2)`

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