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NEET2024ChemistryThermodynamics (C)Actual

For the following reaction at 300 K A ₂( ~g )+3 ~B ₂( ~g ) 2 AB ₃( ~g ) the enthalpy change is +15 kJ then the internal energy change is:

Options

  1. A19988.4 ~J
  2. B200 J
  3. C1999 J
  4. D1.9988 kJ

Correct answer

A. 19988.4 ~J

Step-by-step solution

A ₂( ~g )+3 ~B ₂( ~g ) 2 AB ₃( ~g ) n_ ( g ) = n _ ( P ) - n _ ( R ) =2-3-1=-2 H= U+ n_g R T15 1000= U-2 8.314 300 U=15000+600 8.314=15000+6 831.4=15000+4988.4 U=19988.4 ~J

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