# Problem: For the reaction2 H2O(g) ⇌ 2 H2(g) + O2(g)The equilibrium concentrations were found to be:[H2O] = 0.250M[H2] = 0.300M[O2] = 0.750 MWhat is the equilibrium constant for this reaction?

###### FREE Expert Solution

We’re being asked to determine the equilibrium constant for this reaction:

2 H2O(g) ⇌ 2 H2(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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###### Problem Details

For the reaction

2 H2O(g) ⇌ 2 H2(g) + O2(g)

The equilibrium concentrations were found to be:

[H2O] = 0.250M

[H2] = 0.300M

[O2] = 0.750 M

What is the equilibrium constant for this reaction?