Consider a closed container, i.e with insulated, rigid, impermeablewalls. The container is been divided into two parts by aninsulated, rigid and impermeable wall. Each part contains and idealgas (suppose it is the same ideal gas in both parts). Initially thegas on the left -side has a volume V1, withN1 atoms at a temperature T1. Likewise, thegas on the right-side has V2, N2,T2.


The wall that separates the gases ``loses´´ its propertyof being rigid, i.e. now it is not rigid, but it is still insulatesand it is impermeable. Supposse that initially , and . Describe the spontaneous process thatoccurs. Find the final thermodynamic state and calculate the changein entropy of the whole system.

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