15) The following reaction is second onler in A and the rate constant is 0.025M^-1s^-1 Aarrow B The concentration of A was 0.65 M at 33 s. The initial concentration of A was __ M A) 2.4 B) 0.27 C) 0.24 D) 1,4 E) 1.2times 10^-2 Answer: D 18) The rate constant of a first-order process that has a half-life of 3.50 min is s^-1 A) 0.693 B) 1.65times 10^-2 C) 1.98 D) 0.198 E) 3.30times 10-3 Answe r: E

15) The following reaction is second order in and the rate constant is The concentration of A was 0.65 M at 33 s. The initial concentration of A was __ MA) 2.4B) 0.27C) 0.24D) 1.4E) Answer: D18) The rate constant of a first-order process that has a half-life of 3.50 min is A) 0.693B) C) 1.98D) 0.198E) Answer: E