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.

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.