In the reaction, hcl (aq) + nahco3 (aq) – nacl (aq) + h20 (1) + co2 (g), which of the reactants or products is a gas? nahco3 nacl h2o co2

CO2 is the gas. The letter subscripts following the reactants and the products are what indicates the state of matter. (s) is solid, (l), it is a lowercase l, is liquid, (g) is gaseous state, and (aq) stands for aqueous solution, which is a solution in which the solvent is water. Hope this helps.