Cyclobutane (C4H8) forms ethylene (C2H4) according to the following equation. C4H8 → 2C2H4 The half-life of this first-order reaction is 22.7 s. If the initial concentration of C4H8 is 1.42 M, what will be the rate of reaction at t = 60 s? Select one: a. 5.2 M/s b. 0.23 M/s c. 4.3 x 10-2 M/s d. 7.0 x 10-3 M/s For many reactions involving enzymes (E) reacting with substrates (S) to form products (P), steady state approximations can be applied to derive the rate law: rate= k₂[E][S] k_1 + k₂ k1 +[S] Which of the following shows the rate law when the concentration of substrate is very large in relation to the k values? Select one: a. rate= kobs [E]o [S] b. rate = kobs[S] C. rate = kobs[E][S] d. rate = kobs [E]