The reaction


2N2O5(g) --> O2(g) +4NO2(g)


is first order in N2O5. For this reaction at 45ºC, the rate constant k = 1.0 × 10–5 s–1.



For a particular experiment ([N2O5]0 = 1.0 × 10–3 M), calculate [N2O5] after 2.6 × 105 seconds.



a. 7.4 x 10^-5 M


b. 1.0 x 10^-3 M


c. 2.6 M


d. 9.5 M