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JEE Main2012ChemistryThermodynamics (C)Actual

The difference between the reaction enthalpy change ( _ r H ) and reaction internal energy change ( _ r U ) for the reaction: 2 C ₆ H ₆( l )+15 O ₂( ~g ) at 300 ~K is ( R =8.314 ~J ~mol ⁻¹ ~K ⁻¹ )

Options

  1. A0 ~J ~mol ⁻¹
  2. B2490 ~J ~mol ⁻¹
  3. C-2490 ~J ~mol ⁻¹
  4. D-7482 ~J ~mol ⁻¹

Correct answer

D. -7482 ~J ~mol ⁻¹

Step-by-step solution

H= U+ n_ g R T For the reaction n_ g =12-15=-3 aligned H- U & =-3 8.314 300 & =-7482 ~J ~mol ⁻¹ aligned

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