Consider this equilibrium:
co2(g) + 2h2o(g) ch4(g) + 2o2(g).

what indicates that the reactants are favored?

keq is zero.
keq is very large.
keq is slightly less than 1.
keq is slightly greater than 1.

The equilibrium constant is a value which represents the equilibrium of a reaction. It is a reaction quotient when the reaction reached equilibrium. If Keq is greater than 1, the mixture contains mostly the products. On the other hand, if Keq is less than 1, the mixture contains the reactants. Therefore, the answer is the second option, Keq is very large.

The correct answer is "atomic weight".