Consider the reaction: 3 N2 (g) + 2 O3 (g) → 6 NO (g) ΔfH ° (kJ/mol) 0.00 142.26 90.37 Sm ° (J mol-1 K-1) 191.5 237.7 210.6 What is ΔrG ° for this reaction in kJ/mol at 350 K?

Explanation:

3 N₂ (g)  + 2  O₃ (g)   →     6 NO (g)

Δ H(rxn ) = 90.37x 6 - ( 0 + 142.26 x 2 )

= 542.22  - 284.52

= 257.7 kJ

Δ S(rxn ) = 6 x 210.6 - ( 2 x 237.7 + 3 x 191.5 )

= 1263.6 - ( 475.4 + 574.5 )

= 213.7 J / K

Δ G = Δ H - T Δ S

= 257.7 - 350  x 213.7

= - 74537.3 kJ  .

Δ G / mole = - 74537.3 / 6 = - 12422.88 kJ / mol.

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