In the discussion on conserving momentum in the reaction AB + C = AC + B, participants focus on applying the principle of conservation of linear momentum to chemical reactions. They highlight that reactant molecules must collide with sufficient kinetic energy and the correct orientation for the reaction to occur, which implies momentum conservation during collisions. A proposed equation for momentum conservation is presented, indicating the relationship between the masses and velocities of the reactants and products. The importance of treating velocities as vector quantities is emphasized, ensuring accurate calculations. Overall, the discussion aims to clarify how to quantitatively demonstrate momentum conservation in this specific chemical reaction.