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![-\dfrac{1}{2}\dfrac{d\left [ NO_{2} \right ]}{dt}\ =\ -2\dfrac{d\left [ O_{2} \right ]}{dt}\ =\ \dfrac{1}{2}\dfrac{d\left [ N_{2}O_{5} \right ]}{dt}](/tpl/images/0259/8821/204f5.png)
is double of the rate of disappearance of oxygen.
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