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Thermodynamics question

2019 · Q99
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Thermodynamics question

2019 · Q99

NEETChemistryThermodynamicsMCQ+4 / −1
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
    25 J
  2. B
    30 J
  3. C
    -30 J
  4. D
    5 kJ
View written solutionFree

Correct answer: C

W = –Pext (V2–V1)

Pext = 2 bar

V1 = 0.1 L

V2 = 0.25 L

W = –2 bar[0.25 – 0.1] L

W = –2 × 0.15 bar L

W = –0.30 bar L

W = (–0.30) × 100 = –30 J

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