**H _{2}(g) + I_{2}(g) ⇌ 2 HI(g) K = 1.00 x 10^{2}**

**Step 1:**** Calculate the concentrations of the reactants and products.**

Recall **molarity**:

$\overline{){\mathbf{Molarity}}{\mathbf{}}{\mathbf{\left(}}{\mathbf{M}}{\mathbf{\right)}}{\mathbf{}}{\mathbf{=}}\frac{\mathbf{mol}}{\mathbf{L}}}$

$\mathbf{\left[}{\mathbf{H}}_{\mathbf{2}}\mathbf{\right]}\mathbf{=}\frac{\mathbf{1}\mathbf{.}\mathbf{00}\mathbf{}\mathbf{mol}}{\mathbf{1}\mathbf{.}\mathbf{00}\mathbf{}\mathbf{L}}\phantom{\rule{0ex}{0ex}}\mathbf{\left[}{\mathbf{H}}_{\mathbf{2}}\mathbf{\right]}\mathbf{=}\frac{\mathbf{1}\mathbf{.}\mathbf{00}\mathbf{}\mathbf{mol}}{\mathbf{L}}$

**[H _{2}] = 1.00 M**

**[I _{2}] = 1.00 M**

**[HI] = 1.00 M**

**Step 2:**** Calculate the reaction quotient.**

$\overline{){\mathbf{Q}}{\mathbf{=}}\frac{\mathbf{products}}{\mathbf{reactants}}}$

$\overline{){\mathbf{Q}}{\mathbf{=}}\frac{\mathbf{products}}{\mathbf{reactants}}}$

$\mathbf{Q}\mathbf{=}\frac{{\mathbf{\left[}\mathbf{HI}\mathbf{\right]}}^{\mathbf{2}}}{\mathbf{\left[}{\mathbf{H}}_{\mathbf{2}}\mathbf{\right]}\mathbf{\left[}{\mathbf{I}}_{\mathbf{2}}\mathbf{\right]}}\phantom{\rule{0ex}{0ex}}\mathbf{Q}\mathbf{=}\frac{{\mathbf{(}\mathbf{1}\mathbf{.}\mathbf{00}\mathbf{)}}^{\mathbf{2}}}{\mathbf{(}\mathbf{1}\mathbf{.}\mathbf{00}\mathbf{)}\mathbf{(}\mathbf{1}\mathbf{.}\mathbf{00}\mathbf{)}}$

**Q = 1.00**

**Q < K** → the reaction shifts in the **forward direction** to reach equilibrium

**Step 3:**** **Construct an ICE chart for the equilibrium reaction.

**Step 4: **Calculate the change (x) in the reaction using the equilibrium constant.

At a particular temperature, *K* = 1.00 x 10^{2} for the reaction

H_{2}(*g*) + I_{2}(*g*) ⇌ 2HI(*g*)

In an experiment, 1.00 mole of H_{2}, 1.00 mole of I_{2}, and 1.00 mole of HI are introduced into a 1.00-L container. Calculate the concentrations of all species when equilibrium is reached.

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Our data indicates that this problem or a close variation was asked in Chemistry: An Atoms First Approach - Zumdahl Atoms 1st 2nd Edition. You can also practice Chemistry: An Atoms First Approach - Zumdahl Atoms 1st 2nd Edition practice problems.