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The first-order decomposition of N2O5 at 328 K has a rate constant of 1.70x10^-3 s^-1. If the initial concentration of N2O5 is 2.88 M, what is the concentration of N2O5 after 12.5 minutes? a) 0.355 M b) 0.124 M c) 2.82 M d) 0.174 M e) 0.805 M