A first-order reaction has rate constant of 4.39 x 10 -3 s−1 at 25 ∘C. What fraction of the starting material would be left after 474 s? What is the half life? The activation energy of this reaction is 70 kJ/mol. If we change the temperature to 69 ∘C what would the new value of the half-life be? a. fraction- Use a decimal approximation b. τ12, 25 C(s) c. τ12, new T (s)

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