A hot air balloon is being inflated to its full extent by heating the air inside it. In the final stages of this process, the volume of the balloon changes from 4.00 x 10^6 L to 4.2 x 10^6 L by the addition of 1.3 x 10^8 J of energy as heat. Assuming that the balloon expands against a constant pressure of 1.0 atm, how much work does the balloon perform?

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