Chemistry

Chemistry

Problem

Consider the catalyzed conversion of substrate S to product P through the following mechanism, in which X is a proposed catalyst: Step 1 (fast equilibrium): X+S  ⇌  XS\text{X}+\text{S}\;\rightleftharpoons\;\text{XS} Step 2 (slow): XS+H→X+P\text{XS}+\text{H}\rightarrow\text{X}+\text{P} Assume the concentration of H remains constant throughout the reaction and that the equilibrium constant for Step 1 is KK. Which rate law is most consistent with this mechanism? a) rate = kobs[S][H]k_{\text{obs}}[\text{S}][\text{H}] b) rate = kobs[X][S]k_{\text{obs}}[\text{X}][\text{S}] c) rate = kobs[X][S][H]k_{\text{obs}}[\text{X}][\text{S}][\text{H}] d) rate = kobs[XS][H]k_{\text{obs}}[\text{XS}][\text{H}]

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