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NEET2019Paper 2019Chemistry
Q.

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

    5 kJ 

  3. C

    25 J

  4. D

    30 J 

Solution

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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