Rates of Reaction

  1. Below is a proposed mechanism for a reaction, with k2 > k1. What is the rate law?

    $$NO_2 + CO~ \xrightarrow{k_1}~ NO + NO_3$$ $$NO_3 + CO~ \xrightarrow{k_2}~ NO_2 + CO_2$$

  2. Below is a proposed mechanism for a reaction, with k1 > k2. What is the rate law?

    $$NO_2 + CO~ \xrightarrow{k_1}~ NO + NO_3$$ $$NO_3 + CO~ \xrightarrow{k_2}~ NO_2 + CO_2$$

  3. Below is a proposed mechanism for a reaction, with k1 > k2. What is the rate law?

    $$NO+ Br_2~ \mathop{\leftrightharpoons}^{k_1}_{k_{-1}}~ NOBr_2$$ $$NOBr_2 + NO~ \xrightarrow{k_2}~ NOBr + NOBr$$

  4. For the mechanism proposed below, determine the overall rate law for k\(_1\) k\(_2\), k\(_1\) > k\(_2\)

    $$2~NO~+~2 H_2~\longrightarrow~2~H_2O~+~N_2~~{overall}$$

    $$2~NO+~H_2~\mathop{\leftrightharpoons}^{k_1}_{k_{-1}}~N_2O~+~H_2O$$ $$N_2O~+~H_2~\xrightarrow{k_2}~N_2~+~H_2O$$

  5. Consider a solution of 0.10 M H\(^{+}\) in 0.10 M thioacetimide at 25 \(^\circ\)C

    rate = k[H\(^{+}\)][CH\(_3\)CSNH\(_2\)]

    How are the rate and the rate constant (k) effected when water is added to the solution? When the reaction is heated to 75\(^\circ\)C ? When NaOH is added?

  6. For the mechanism proposed below, use the quasi (pseudo) steady state approximation to determine the overall rate law assuming the pseudo steady state.

    $$2~NO~+~2 H_2~\longrightarrow~2~H_2O~+~N_2~~{overall}$$
    $$2~NO+~H_2~\mathop{\leftrightharpoons}^{k_1}_{k_{-1}}~N_2O~+~H_2O$$ $$N_2O~+~H_2~\xrightarrow{k_2}~N_2~+~H_2O$$

  7. The initial concentration of hydroiodic acid is 100 mmol/L but after 500 s it is 17 mmol/L. What is the rate? (note the products of this reaction are hydrogen and iodine gas)

  8. For the mechanism below, determine the overall rate law.

    $$2~NO~+~Br_2~\longrightarrow~2~NOBr~~{overall}$$

    $$NO+~Br_2~\mathop{\leftrightharpoons}^{k_1}_{k_{-1}}~NOBr_2$$ $$NOBr_2~+~NO~\xrightarrow{k_2}~2NOBr$$

  9. The following initial rate data was collected for the reaction, A + 2B \(\longrightarrow\) products

    reaction order chemistry problem

    A. Find the order of reaction for each reactant
    B. Find the rate constant

  10. Derive the rate law given the elementary steps.

    $$Cl_2~\mathop{\leftrightharpoons}^{k_1}_{k_{-1}}~2~Cl~~{1}$$ $$Cl+~CHCl_3~\xrightarrow{k_2}~HCl~+~CCl_3~~{2}$$ $$Cl~+~CCl_3~\xrightarrow{k_3}~CCl_4~~{3}$$

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