Problem: Consider the following reaction: 2CH4(g) ⇌ C2H2(g) + 3H2(g)The reaction of CH4 is carried out at some temperature with an initial concentration of [CH4] = 0.089 M. At equilibrium, the concentration of H2 is 0.016 M. Find the equilibrium constant at this temperature.

FREE Expert Solution

We are being asked to calculate Kc for the given reaction:

2CH4(g) C2H2(g) + 3H2(g)

When dealing with equilibrium and Kc:

Kc → equilibrium units in terms of concentration (i.e. molarity)
Kc is an equilibrium expression:

$\overline{){{\mathbf{K}}}_{{\mathbf{c}}}{\mathbf{=}}\frac{\mathbf{products}}{\mathbf{reactants}}}$

solid species are not included in the equilibrium expression
▪ the coefficient of each compound in the reaction equation will be the exponent of the concentrations in the equilibrium expression

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Problem Details

Consider the following reaction: 2CH4(g) ⇌ C2H2(g) + 3H2(g)

The reaction of CH4 is carried out at some temperature with an initial concentration of [CH4] = 0.089 M. At equilibrium, the concentration of H2 is 0.016 M. Find the equilibrium constant at this temperature.