Multiple choice The first-order reaction rate constant is = 2.303/t 2.303/t log ([A0]/ [A] ) 2.303/t log 2.303 / k log ([A0]/ [A] ) Reveal answer Fill a bubble to check yourself B Correct answer Explanation The integrated rate law for a first-order reaction is k = (2.303/t) * log([A0]/[A]).