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 $1 \; L \; bar = 100 \; J$]
- A$-30 \; J$
- B$5 \; kJ$
- C$25 \; J$
- D$30 \; J$
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