is first order in N₂O₅. For this reaction at 45°C, the rate constant k = 1.0 x 10⁻⁵ s⁻¹, where the rate law is defined as
Rate =
For a particular experiment ([N₂O₅]₀ = 1.0 x 10⁻³ M), calculate [N₂O₅] after 3.5 x 10⁵ seconds.