A \( \frac {∆NO_2} {∆t} \)
B \( \frac{1}{2} \frac {∆N_2O_5} {∆t} \)
C \( -\frac {∆N_2O_5} {∆t} \)
D \( +\frac{1}{4} \frac {∆NO_2} {∆t} \)
Correct Answer: Option D
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