Review Equilibrium

For the graph, choose the CORRECT statement.

• The rate of reaction slowly increase

• The systems never reach equilibrium

• At equilibrium, more NO₂ is present than N₂O₄.

• At start of reaction, only NO₂ was present.

For the reaction, choose the CORRECT equilibrium constant, K_c.

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At elevated temperatures ammonium carbonate, NH₂COONH₄, is in equilibrium with NH₃ and CO₂ according to the equation;

NH₂COONH₄(s) ↔ 2 NH₃(g) + CO₂(g)

What is the equilibrium expression for this reaction?

• K = 2 [NH₃][CO₂]

  [NH₂COONH₄]

• K = [NH₃]²[CO₂]

  [NH₂COONH₄]

• K = 2 [NH₃][CO₂]

• K = [NH₃]²[CO₂]

Which is the reactant - and why?

• A, as concentration decreases
• B, as concentration decreases
• A, as concentration increases
• B, as concentration increases

At what time the reaction reached equilibrium?

• t₁
• t₂
• t₃
• t₄