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MHT CET Medical202621 April 2026Evening ShiftChemistryThermodynamics (C)Actual

The ' x ' moles gas is allowed to expand isothermally and reversibly from 10 dm ^3 to 20 dm ^3 at 300 K and -17290 J work is obtained. Find the value of ' x '. [2.303 R = 19.15 J K ⁻¹ mol ⁻¹]

Options

  1. A4
  2. B6
  3. C8
  4. D10

Correct answer

D. 10

Step-by-step solution

For an isothermal reversible expansion, the work done is given by W = -2.303 n R T ₁₀ ( V₂ V₁ ) Substituting the given values: -17290 = -x (2.303 R) T ₁₀ ( 20 10 ) -17290 = -x 19.15 300 ₁₀(2) -17290 = -x 19.15 300 0.301 -17290 = -x 1729.245 x = 17290 1729.245 10 Answer: 10

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