Recall that for a reaction **aA ****→**** bB**, the ** rate of a reaction** is given by:

$\overline{){\mathbf{Rate}}{\mathbf{=}}{\mathbf{-}}\frac{\mathbf{1}}{\mathbf{a}}\frac{\mathbf{\Delta}\mathbf{\left[}\mathbf{A}\mathbf{\right]}}{\mathbf{\Delta t}}{\mathbf{=}}\frac{\mathbf{1}}{\mathbf{b}}\frac{\mathbf{\Delta}\mathbf{\left[}\mathbf{B}\mathbf{\right]}}{\mathbf{\Delta t}}}$

What is the average rate of formation of I_{2}? Express your answer to three decimal places and include the appropriate units.

Now consider the following reaction and data:

H_{2} + 2 IF → 2 HF + I_{2}

Time (s ) | I2 concentration ( M ) |

5 | 1.12 |

15 | 1.56 |

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