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BITSAT2021ChemistryThermodynamics (C)Actual

Work out the heat change (cal) when 40 ~g of He gas at 27^ C undergoes isothermal and reversible compression from initial pressure of 1 ~atm to 10 ~atm ( R =2 cal K ⁻¹ ~mol ⁻¹ ) .

Options

  1. A13.818 kcal
  2. B-13.818 kcal
  3. C55.272 kcal
  4. D-55.272 k cal

Correct answer

B. -13.818 kcal

Step-by-step solution

aligned q &=- w _ rev =- (-2.303 nRT P ₁ P ₂ ) &=2.303 40 4 2 300 1 10 =-13.82 kcal aligned

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