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15) The first-order reaction, 2 N2O(g) →2 N2(g) +O2(g), has a rate constant equal to 0.76 s-1 at 1000 K. How long will it take for the concentration of N2O to decrease to 12% of its initial concentration? A) 6.3 s B) 0.62 s C) 2.8 s D) 8.4 s