(Solved): 6) The following substrate concentration [S] versus time data were obtained during an enzymecatalys ...

6) The following substrate concentration [S] versus time data were obtained during an enzymecatalysed reaction: $$t=0\min ,[\mathrm{S}]=1.00\mathrm{M};20\min ,0.90\mathrm{M};60\min ,0.70\mathrm{M};100\mathrm{M},0.50\mathrm{M};160\min ,0.20$$ $$M$$. What is the order of this reaction with respect to $$S$$ in the concentration range studied? 7) The mechanism proposed for the reaction of $${\mathrm{H}}_2(\mathrm{g})$$ and $${\mathrm{I}}_2(\mathrm{g})$$ to form $$\mathrm{HI}(\mathrm{g})$$ consists of a fast, reversible step involving $$I_2(\mathrm{g})$$ and $$I(\mathrm{g})$$, followed by a slow step. Propose a two-step mechanism for the reaction $${\mathrm{H}}_2(\mathrm{g})+{\mathrm{I}}_2(\mathrm{g})?2\mathrm{HI}(\mathrm{g})$$, which is known to be first order in $${\mathrm{H}}_2$$ and first order in $${\mathrm{I}}_2$$.