The Reaction 2NO(g) + O₂(g) $\rightarrow$ 2NO₂(g) Has $\Delta$ H_r ^$\omicron$ = -4 KJ

question 13

Multiple Choice

The reaction 2NO(g) + O₂(g) $\rightarrow$ 2NO₂(g) Has $\Delta$ H_r ^$\omicron$ = -4 kJ.mol^-1.
A possible mechanism for this reaction is
2NO(g) Rapid equilibrium,K
$f$
N₂O₂(g)
N₂O₂(g) +O₂(g) $\rightarrow$ 2NO₂(g)
Slow,K
If the activation energy for the reverse reaction is 225 kJ.mol^-1.
What is the activation energy for the forward reaction?

• A) Because an intermediate is involved, the forward activation energy cannot be calculated with the given information.
• B) 111 kJ.mol^-1.
• C) 339 kJ.mol^-1.
• D) 114 kJ.mol^-1.
• E) 55.5 kJ.mol^-1.

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