Question

which direction does this reaction shift when o₂ is added to the solution?
2no(g) + o₂(g) ⇌ 2no₂(g) + 113.06 kj
the reaction shifts right or to products.
the reaction shifts left or to reactants.
the reaction does not shift.

Explanation:

To determine the direction of the reaction shift when \( O_2 \) is added, we use Le Chatelier's principle. Le Chatelier's principle states that if a stress (such as a change in concentration) is applied to a system at equilibrium, the system will shift in a direction that relieves the stress.

In the given reaction \( 2NO(g) + O_2(g)
ightleftharpoons 2NO_2(g) + 113.06 \, kJ \), \( O_2 \) is a reactant. When we add more \( O_2 \) (increase the concentration of a reactant), the system will try to reduce this increase by consuming the added \( O_2 \). This means the reaction will shift in the direction that produces more products (to the right) to use up the excess \( O_2 \).

Answer:

The reaction shifts right or to products.