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The following reaction is performed at 298 K. 2NO(g) + O 2 (g) 2NO 2 (g) The standard free energy of formation of NO(g) is 86.6 kJ/mol at 298 K. What is the standard free energy of formation of NO 2 (g) at 298 K? (K p = 1.6 × 10 12 )

1. R(298) l n(1.6 × 10 12 ) – 86600
2. 86600 + R(298) l n(1.6 × 10 12 )
3. ) 298 ( R ) 10 6 . 1 ( n 86600 12 × − l
4. 0.5[2 × 86,600 – R(298) l n(1.6 × 10 12 )]

Correct answer: 0.5[2 × 86,600 – R(298) l n(1.6 × 10 12 )]

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