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NTA Abhyas JEE Main2020ChemistryThermodynamics (C)Practice

Consider the reaction 2 NO(g) + O 2 (g) → 2 NO 2 (g) ; Predict whether the reaction is spontaneous at 298 K . (Given: Δ f G NO = 86 .69 kJ/mol, Δ f G NO 2 = 51 .84 kJ/mol )

Options

  1. AYes, spontaneous
  2. BNo, the reaction is Non-spontaneous
  3. CEquilibrium
  4. DCannot predict

Correct answer

A. Yes, spontaneous

Step-by-step solution

For the reaction : 2 NO(g) + O 2 (g) → 2 NO 2 (g) ΔG   =   2Δ f G NO 2 −   2Δ f G NO   +   Δ f G O 2 = 2 × 5 1 . 8 4 - 2 × 8 6 . 6 9 + 0 = 1 0 3 . 6 8 - 1 7 3 . 3 8 = - 6 9 . 7 kJ/mol ∵ ΔG is negative so, the reaction is spontaneous

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