One mole of an ideal gas first undergoes an isothermal expansion at a temperature T1 = 650 K to 5 times its original volume. The temperature is then reduced in an isochoric process to T2 = 350 K. An isothermal compression takes the gas back to its original volume and a final isochoric process returns the system to temperature T1. How much heat (in J) is exchange between the system and its surroundings?

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