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4) The half-life for the second-order decomposition of HI is 15.4 s when the initial concentration of HI is 0.67 M. What is the rate constant for this reaction? A) 2.2 × 10-2 M-1s-1 B) 1.0 × 10-2 M-1s-1 C) 9.7 × 10-2 M-1s-1 D) 3.8 × 10-2 M-1s-1 E) 4.5 × 10-2 M-1s-1