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A mass of gas at an initial pressure of 3 700 kPa and with an internal energy of
2 100 kJ, is contained in a well-insulated cylinder of volume 0.09 m³. The gas
is allowed to expand behind a piston until its internal energy and volume are
1900 kJ and 0.225 m³. The law of expansion is PV2 = constant. Calculate:
1.1.1. The work done.
1.1.2. The final pressure.

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