If 1.8 moles of NO2 are initially present in a sealed 1.00 liter vessel at 25◦ C, what is the half-life (in years) of the reaction?

If 1.8 moles of NO2 are initially present in a
sealed 1.00 liter vessel at 25◦ C, what is the
half-life (in years) of the reaction?

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