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MHT CET202016 Oct 2020Morning ShiftChemistryThermodynamics (C)Actual

An ideal gas expands isothermally and reversibly from 10 ~m ³ to 20 ~m ³ at 300 ~K , performing 5 187 ~kJ of work on surrounding, calculate number of moles of gas used?

Options

  1. A1
  2. B3
  3. C2
  4. D1.5

Correct answer

B. 3

Step-by-step solution

(A) array l V₁=10 ~m ³=10 10³ dm ³ V₂=20 ~m ³=20 10³ dm ³ array T=300 K, W=-5.187 ~kJ =-5187 ~J W=-2.303 nRT V₂ V₁ -5187=-2.303 n 8.314 300 ₁₀ 20 10³ 10 10³ n= 5187 2.303 8.314 300 0.301 n=3 moles

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