The given chemical reaction is:

[COCl_2(g) \rightleftharpoons CO(g) + Cl_2(g) \quad K = 1.5 \times 10^{10}]

Are the reactants or products lower in energy? Select the single best answer.

reactants

both are at the same energy

products

The products are lower in energy. This can be inferred from the value of the equilibrium constant (K) being very large (1.5 x 10^10), indicating that the reaction strongly favors the formation of products over reactants.