Use the References to access important values if needed for this question. In the following equation for a chemical reaction, the notation (5), (D), or (g) indicates whether the substance indicated is in the solid, liquid, or gaseous state. 2CO(g)+O2(g)2CO2(g)+energy Identify each of the following as a product or a reactant: O2(g)CO(g)CO2(g) When the reaction takes place energy The reaction is