The decomposition of hydrogen peroxide in aqueous solution is found experimentally to…

CHEMISTRY · Single correct · AP · Chemistry · Kinetics · Kinetics

Problem

The decomposition of hydrogen peroxide in aqueous solution is found experimentally to obey the rate law rate=k[H2O2][I−]\text{rate} = k[\mathrm{H_2O_2}][I^-], where I−I^- is present in catalytic amounts. Which proposed two-step mechanism is most consistent with both the rate law and the fact that I−I^- is a catalyst? (a) (1) H2O2+I−→H2O+IO−(fast)H_2O_2 + I^- \rightarrow H_2O + IO^- \quad (\text{fast})\ (2) H2O2+IO−→H2O+O2+I−(slow)H_2O_2 + IO^- \rightarrow H_2O + O_2 + I^- \quad (\text{slow}) (b) (1) 2 H2O2→2 H2O+O2(slow)2\,H_2O_2 \rightarrow 2\,H_2O + O_2 \quad (\text{slow})\ (2) O2+2 I−→2 IO−(fast)O_2 + 2\,I^- \rightarrow 2\,IO^- \quad (\text{fast}) (c) (1) H2O2+I−→H2O2I−(slow)H_2O_2 + I^- \rightarrow H_2O_2I^- \quad (\text{slow})\ (2) H2O2I−→2 H2O2+I−(fast)H_2O_2I^- \rightarrow 2\,H_2O_2 + I^- \quad (\text{fast}) (d) (1) H2O2+I−→H2O+IO−(slow)H_2O_2 + I^- \rightarrow H_2O + IO^- \quad (\text{slow})\ (2) IO−+O2→I−+O3(fast)IO^- + O_2 \rightarrow I^- + O_3 \quad (\text{fast})

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