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Lesson 17, Topic 2
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Calculating the Equilibrium Constant

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Example

Question: Calculate the equilibrium constant for the decomposition of ammonia, given the following information.

The decomposition equilibrium for ammonia is:

2\text{NH}_3 (g) ⇌ \text N_2 (g) + 3\text H_2 (g)

Now, the equilibrium constant expression for this reaction may be written as follows, substituting in the substances and molar ratios:

K_{\text{eq}} = \frac{[\text N_2][\text H_2]^3}{[\text{NH}_3]^2}

Finally, the values from the table should be substituted into this expression to calculate Keq:

K_{\text {eq}} \frac{[0.71][2.14]^3}{[1.42]^2} = 3.5