Solution-Equilibrium expression for combustion of methane

1) Describe the different ways to shift the equilibrium to the left for the following reaction:

2 A (s) + 2 BC (aq) –> 2 AB (aq) + C2(g).

Justify your answer.

?H = -352 kJ 

2) A classmate asks for your help writing an equilibrium expression for the combustion of methane gas: CH4(g) + 2 O2(g)  –> CO2(g) + 2 H2O(l). Explain to her why it is not meaningful to create an equilibrium expression or calculate an equilibrium constant for this reaction.

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