16. A first-order reaction is 40.0% complete at the end of 28.7 minutes. What is the value of the rate constant (in min^-1)? (A) 3.19 x 10^-2 (B) 1.78 x 10^-2 (C) 56.2 (D) 31.3 (E) none of these

5. According to the Brønsted-Lowry definition, an acid is (A) a substance that increases the hydrogen ion concentration in solution. (B) a substance that increases the hydroxide ion concentration in solution. (C) a substance that can donate a proton to another species. (D) a substance that can accept a proton from another species. (E) an electron pair acceptor.

16. A first-order reaction is 40.0% complete at the end of 28.7 minutes. What is the value of the rate constant (in min^-1)?

(A) 3.19 x 10^-2

(B) 1.78 x 10^-2

(C) 56.2

(D) 31.3

(E) none of these

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