Data Table 1: | Experiment | A | B | C | | :--- | :--- | :--- | :--- | | concentration of HCl, M | 0.6 | 0.3 | 0.2 | | concentration of Na2S2O3, M | 0.12 | 0.12 | 0.12 | | Trial 1 Reaction Time, s | 46.59 | 50.56 | 67.78 | | Trial 2 Reaction Time, s | 49.91 | 48.66 | 62.81 | Determine the average reaction time in seconds for each experiment. Use correct significant figures. A: B: C: Blank # 1 Blank # 2 Blank # 3
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The average reaction time is calculated by adding the reaction times of Trial 1 and Trial 2 and then dividing by 2. For experiment A: The reaction times are 46.59s and 49.91s. So, the average reaction time is (46.59s + 49.91s) / 2 = 48.25s. For experiment B: The Show more…
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Three different sets of data of $[\mathrm{A}]$ versus time are giv the following table for the reaction $A \longrightarrow$ prod [Hint: There are several ways of arriving at answer each of the following six questions. $$\begin{array}{cccccc} \hline \text { I } & & \text { II } & & \text { III } & \\ \hline \begin{array}{c} \text { Time, } \\ \text { s } \end{array} & \text { [A], M } & \begin{array}{c} \text { Time, } \\ \text { s } \end{array} & \text { [A], M } & \begin{array}{c} \text { Time, } \\ \text { s } \end{array} & \text { [A], M } \\ \hline 0 & 1.00 & 0 & 1.00 & 0 & 1.00 \\ 25 & 0.78 & 25 & 0.75 & 25 & 0.80 \\ 50 & 0.61 & 50 & 0.50 & 50 & 0.67 \\ 75 & 0.47 & 75 & 0.25 & 75 & 0.57 \\ 100 & 0.37 & 100 & 0.00 & 100 & 0.50 \\ 150 & 0.22 & & & 150 & 0.40 \\ 200 & 0.14 & & & 200 & 0.33 \\ 250 & 0.08 & & & 250 & 0.29 \\ \hline \end{array}$$ What is the approximate concentration of A remaining after 110 s in the (a) zero-order, (b) first-order, (c) second-order reaction?
Experimental data for the reaction $$\mathrm{A} \longrightarrow 2 \mathrm{B}+\mathrm{C}$$ have been plotted in the following three different ways (with concentration units in $\mathrm{mol} / \mathrm{L}$ ): CAN'T COPY THE FIGURE a. What is the order of the reaction with respect to $\mathrm{A}$, and what is the initial concentration of $A ?$ b. What is the concentration of $A$ after 9 s? c. What are the first three half-lives for this experiment?
Experimental data in the table are for the hypothetical reaction $$\begin{array}{cc} & \mathrm{A} \longrightarrow 2 \mathrm{~B} & \\ \hline \text { Time (s) } & {[\mathbf{A}](\mathrm{mol} / \mathrm{L})} \\ \hline 0.00 & 1.000 \\ 10.0 & 0.833 \\ 20.0 & 0.714 \\ 30.0 & 0.625 \\ 40.0 & 0.555 \end{array}$$ (a) Make a graph of concentration as a function of time, draw a smooth curve through the points, and calculate the rate of change of [A] for each 10 -s interval from $0.00$ to $40.0 \mathrm{~s}$. Why might the rate of change decrease from one time interval to the next? (b) How is the rate of change of [B] related to the rate of change of $[\mathrm{A}]$ in the same time interval? (c) Calculate the rate of change of [B] for the time interval from $10.0$ to $20.0 \mathrm{~s}$.
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