At 55° the decomposition of N2O5 is first order,having a rate constant,k = 1.7 × 10-3 s-1.If the initial concentration of N2O5 is 6.4 × 10-3 M,the number of half-lives that are required for the N2O5 concentration to fall to 2.0 × 10-4 M is ________,and the amount of time required is ________ minutes.
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