Under isothermal co...
 
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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.  

  

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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) –30 J

(2) 5 kJ

(3) 25 J

(4) 30 J

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Correct option:(1)

Explanation:

 ∴ Wirr = -Pext △V

= – 2 bar × (0.25 – 0.1) L

= – 2 × 0.15 L-bar

= – 0.30 L-bar

= – 0.30 × 100 J

= – 30 J

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