A.)[ch4][h2o]/[co][h2]3
b.)[co][h2]3/[ch4][h2o]
c.)[h2o][h2]3/[ch4][co]

A.)[CO2][ZnO]/[ZnCO3]
B.)[CO2]
C.)[CO2]/[ZnCO3]

A.)is homogenous
B.)is at equilibrium under any condition
C.)is heterogeneous

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I'll give you an example of the equilibrium expression for another equation.

2HI (g) \rightleftharpoons H_2 (g) + I_2 (s)

K_p = \frac{(P_{H_2})(P_{I_2})}{(P_{HI})^2}

But since I_2 is a solid, then, P_(I2) = 1

Thus;

K_p = \frac{(P_{H_2})}{(P_{HI})^2}

HCOOH (aq) \rightleftharpoons HCOO^- (aq)+ H^+ (aq)

K_c = \frac{[HCOO^-][H^+]}{[HCOOH]}


Then, what is the definition of homogeneous and heterogeneous?
By what is an equilibrium affected?