The Data Below Were Determined for the Reaction Shown Below $\rarr$

question 66

Multiple Choice

The data below were determined for the reaction shown below.S₂O₈^2- + 3I ^- (aq) $\rarr$ 2SO₄^2- + I₃^-

$\begin{array}{lccc}\text { Expt. \# } & \left[\mathrm{S}_{2-} \mathrm{O}_{8}{ }^{2}\right] & {[I-]} & \text { Initial Rate } \\\hline 1 & 0.038 & 0.060 & 1.4 \times 10^{-5} \mathrm{M} / \mathrm{s} \\2 & 0.076 & 0.060 & 2.8 \times 10^{-5} \mathrm{M} / \mathrm{s} \\3 & 0.076 & 0.030 & 1.4 \times 10^{-5} \mathrm{M} / \mathrm{s}\end{array}$ The rate law for this reaction must be:

• A) rate = k[S₂O₈^2- ][I ^-]³
• B) rate = k[S₂O₈^2-]
• C) rate = k[S₂O₈^2-]²[I ^-]²
• D) rate = k[I ^-]
• E) rate = k[S₂O₈^2-][I ^-]

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