Write an equilibrium expression for each chemical equation involving one or more solid or liquid reac- tants or products. 1. 2C(s)+O2(g)===2CO(g) Use A for [C], B for [O2], C for [CO] 2. C(s)+CO2(g)===2CO(g) Use A for [C], B for [CO2], C for [CO] 3. CO^2-3(aq)+H2O(l)===HCO^-3(aq)+OH^-(aq) Use A for [CO^2-3], B for H2O, C for [HCO^-3, D for [OH^-]. 4. HCHO2(aq)+H20(l)===H3O^+(aq)+CHO^-2(aq) Use A for [HCHO2],B for [H2O], C for [H30^+], D for [OH^-]