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# Solution: For the reaction shown here:2H2O(g)  ⇌ 2H2(g)+O2(g)the equilibrium concentrations were found to be:[H2O]=0.250 M[H2]=0.560 M[O2]=0.800 MWhat is the equilibrium constant for this reaction?Keq =?

###### Problem

For the reaction shown here:
2H2O(g)  ⇌ 2H2(g)+O2(g)

the equilibrium concentrations were found to be:

[H2O]=0.250 M
[H2]=0.560 M
[O2]=0.800 M

What is the equilibrium constant for this reaction?
Keq =?

###### Solution

We’re asked to determine the equilibrium constant, Keq for the given reaction:

2H2O(g)  2H2 (g) + O2 (g)

Recall that the equilibrium constant is the ratio of the products and reactants

We use Kp when dealing with pressure and Kc when dealing with concentration:

$\overline{){{\mathbf{K}}}_{{\mathbf{p}}}{\mathbf{=}}\frac{{\mathbf{P}}_{\mathbf{products}}}{{\mathbf{P}}_{\mathbf{reactants}}}}$     $\overline{){{\mathbf{K}}}_{{\mathbf{c}}}{\mathbf{=}}\frac{\mathbf{\left[}\mathbf{products}\mathbf{\right]}}{\mathbf{\left[}\mathbf{reactants}\mathbf{\right]}}}$

Note that solid and liquid compounds are ignored in the equilibrium expression.

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