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KVPY2016ChemistryThermodynamics (C)

Given array ll NO ( g )+ O ₃( ~g ) NO ₂( ~g )+ O ₂( ~g ) & H =-198.9 ~kJ / mol O ₃( ~g ) 3 / 2 O ₂( ~g ) & H =-142.3 ~kJ / mol O ₂( ~g ) 2 O ( g ) & H =+495.0 ~kJ / mol array The entalpy change ( H ) for the following reaction is NO ( g )+ O ( g ) NO ₂( ~g )

Options

  1. A-304.1 ~kJ / mol
  2. B+304.1 ~kJ / mol
  3. C-403.1 ~kJ / mol
  4. D+403.1 ~kJ / mol

Correct answer

A. -304.1 ~kJ / mol

Step-by-step solution

NO + O ₃ NO ₂+ O ₂ H =-198.9 KJ / mole O ₃ 3 2 O ₂( ~g ) H =-142.3 KJ / mole O ₂ 2 O ₂( ~g ) H =+495.0 KJ / mole H of NO + O ( g ) NO ₂( ~g ) For this i - ii - iii 2 =-198.9-(-142.3)- 495 2 =-304.1 KJ / mole

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