For the decomposition of gaseous dinitrogen pentaoxide, 2 N2O5(g)→4 NO2(g) + O2(g) the rate constant is k = 2.8 × 10−3s−1 at 60°C. The initial concentration of N2O5 is 1.92 mol/L. (a) What is [N2O5] after 5.00 min? mol   L  (b) What fraction of the N2O5 has decomposed after 5.00 min?

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