If the rate constant for the decomposition reaction of cyclobutane into ethylene is 2.08102s1 at a certain temperature, how many seconds are required for the initial concentration (3.35) to decrease to 1.70? (Hint: What is the rate order based on k 's units?) Your Answer: Answer units If the decomposition of a compound follows a first order reaction and the initial concentration of 2.3M drops to 0.30 after only 100 seconds, what is the reaction rate constant at that temperature? Your Answer: Answer units