1 mole of ideal gas 1st undergoes an isothermal expansion at 500 K to 3 times its v(original vlm). The T is then reduced in an isochoric process to 250 K. Then isothermal compression takes the gas back to its v(orgnl vlm) and a final isochoric process returns the system to temperature T1 .find amount of heat (in J) that is exchanged between the system and its surroundings? [ heat expelled from the system is -ve)

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