Under isothermal condition, a gas at 300 K expands from 0.1 L to 0.25 L against a constant external pressure of 2 bar. The work done by the gas is (Given that 1 L bar = 100 J)

1. A. 30 J
2. B. -30 J
3. C. 5 kJ
4. D. 25 J

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