Oxygen weighing 0.6 kg occupied a volume of 1.4 m^3 at a temperature of 580 K. As a result of the supply of heat, it expanded and occupied a volume of 2.8 m^3, and the temperature remained unchanged. Find the change in the internal energy of the gas, the work done by it and the amount of heat imparted to the gas. The molar mass of oxygen is 0.032 kg/mol.

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