Which equilibrium system least favors the formation of products?
A. 2HgO(s)2Hg(l) + O₂(g) Keq = 1.2 x 10⁻²²
B. CH₃COOH(aq) + H₂O(l) H₃O+(aq) + CH3COO-(aq) Keq = 1.8 x 10⁻⁵
C. 2NO(g) + O₂(g) 2NO₂(g) Keq = 6.5 x 10⁵
D. 2(g) + Cl₂(g) 2HCl(g) Keq = 1.8 x 10³³