Taking note of the equilibrium

4HCl(g) + O2(g) ----> 2H2(g) + 2Cl2(g).

What would be the the equilibrium law expression for the balanced chemical equation?

Kc=[H2O]^2[Cl2]^2/[HCl]^4[O2]

To determine the equilibrium law expression for the given balanced chemical equation, we need to express the equilibrium constant in terms of the concentrations of the species involved. The equilibrium law expression is commonly known as the equilibrium constant expression.

In this case, the balanced chemical equation is:

4HCl(g) + O2(g) → 2H2(g) + 2Cl2(g)

The equilibrium law expression is written using the concentrations of the reactants and products raised to the power of their respective coefficients in the balanced equation.

Therefore, the equilibrium law expression for this chemical equation would be:

Kc = [H2]^2 [Cl2]^2 / [HCl]^4 [O2]

In this expression, the concentrations are enclosed in square brackets [ ] and the coefficient of each species in the balanced equation is used as the power to which the concentration is raised.

It's important to note that the equilibrium constant (Kc) is specific to a particular reaction at a given temperature and pressure.

Remember that Keq = the product of the products of the reaction divided by the product of the reactants, each raised to a power indicated by the coefficient in the balance chemical equation.

No. See my response to your repost above.

H2 and Cl2 are the products of the reaction. Right? and where did the H2O come from? That isn't anywhere in the equation.

My best answer would be:

HCl]4[O2] / [H2O]2[Cl2]2

Is this correct?