Question

which direction does this reaction shift when i₂ is removed?
51.8 kj + h₂(g) + i₂(g) ⇌ 2hi(g)
the reaction does not shift.
the reaction shifts right or to products.
the reaction shifts left or to reactants.

Explanation:

Step1: Recall Le Chatelier's Principle

Le Chatelier's Principle states that if a stress is applied to a system at equilibrium, the system will shift in a direction that relieves the stress. In this reaction, the equilibrium is \( 51.8\space kJ + H_2(g)+I_2(g)
ightleftharpoons 2HI(g) \).

Step2: Analyze the stress (removal of \( I_2 \))

\( I_2(g) \) is a reactant. Removing a reactant (decreasing its concentration) is a stress. The system will try to counteract this stress by producing more of the removed reactant. To produce more \( I_2 \), the reaction will shift in the direction that forms reactants, which is the left (reverse) direction. So the reaction shifts left or to reactants.

Answer:

The reaction shifts left or to reactants.