What principle explains why ammonia is continuously removed from a reaction mixture in industrial use?

• A. Boyle's law
• B. Charles's law
• C. Heisenberg's law
• D. Le Châtelier's principle

Answer: (D)

Le Châtelier's principle describes how a system at equilibrium responds to changes in concentration, pressure, or temperature to counteract those changes. In the context of the reaction mixture producing ammonia, if ammonia is continuously removed from the system, the equilibrium will shift to the right to produce more ammonia. This dynamic adjustment occurs to maintain balance and uphold the equilibrium state.

In industrial processes, such as the Haber process for synthesizing ammonia, removing ammonia from the reaction mixture is done to enhance the overall yield of the product. By consistently decreasing the concentration of ammonia in the system, the reaction will favor the formation of more ammonia from the reactants. This method increases efficiency and maximizes the amount of ammonia produced over time.

Other principles listed, such as Boyle's law or Charles's law, deal with gas behavior under pressure and temperature, respectively, rather than chemical equilibrium. Heisenberg's law, relating to quantum mechanics, does not apply to the behavior of chemical reactions in this context. Thus, Le Châtelier's principle is the appropriate explanation for why ammonia is continuously removed during industrial reactions.