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A rigid, insulated vessel is divided into two equal parts. One side is totally evacuated and the other contains 2 kg of air (ideal gas)

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A rigid, insulated vessel is divided into two equal parts. One side is totally evacuated and the other contains 2 kg of air (ideal gas) at 60 C and 4 bar. A partition is removed, and the air expands to fill the entire vessel, eventually coming to equilibrium. Find: (a) The final temperature (C) (Hint: use the 1st law for the entire vessel) (b) The final pressure (bar)

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