Which statement describes a reversible reaction at equilibrium?
(1) the activation energy of the forward reaction must equal the activation energy of the reverse reaction.
(2) the rate of the forward reaction must equal the rate of the reverse reaction.
(3) the concentration of the reactants must equal the concentration of the products.
(4) the potential energy of the reactants must equal the potential energy of the products.

Phosgene (carbonyl chloride), cocl2, is an extremely toxic gas that is used in manufacturing certain dyes and plastics. phosgene can be produced by reacting carbon monoxide and chlorine gas at high temperatures: co(g) cl2(g)⇌cocl2(g) carbon monoxide and chlorine gas are allowed to react in a sealed vessel at 477 ∘c . at equilibrium, the concentrations were measured and the following results obtained: gas partial pressure (atm) co 0.830 cl2 1.30 cocl2 0.220 what is the equilibrium constant, kp, of this reaction