2ch4 (g) c2h2 (g) 3h2 (g) describe what is happening within the system when it is at equilibrium in terms of concentrations, reactions that occur, and reaction rates.

The balanced reaction that describes the decomposition of methane to produce C2H2 and hydrogen is expressed 2ch4 (g) = c2h2 (g) + 3h2 (g) In the equilibrium, there are 4 moles of gas products produced from 2 moles of gas reactant. Hence, an increase in volume favors the forward reaction while increase in pressure favors the production of methane (backward). Equilibrium constant is expressed: Kp = (c2H2) ^2 (H2) ^3 / (Ch4) ^2