Work Done in Expansion against Constant Pressure

2019 1 question

1. 1 Thermodynamics Medium
   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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