Equilibrium Expressions

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]

Tags

NGSS.HS-PS1-7

What is the equilibrium-constant expression for 
CO₂(g) + H₂(g) ↔ CO(g) + H₂O(l)

• K_c= [CO][H₂O] / [CO₂][H₂]  

• K_c= [CO₂][H₂] / [CO]

• K_c= [CO₂][H₂] / [CO][H₂O]

• K_c= [CO] / [CO₂][H₂]  

What is the correct equilibrium expression for the following reaction:
2H₂O₂(aq) ↔ 2H₂O(l) + O₂(g)

• [H₂O]²[O₂] / [H₂O₂]²

• [H₂O₂]² / [H₂O]²[O₂]

• [O₂] / [H₂O₂]²

• [H₂O]² / [H₂O₂]²

When 0.40 mole of SO₂ and 0.60 mole of O₂ are placed in an evacuated 1.00–liter flask, the reaction represented below occurs.

2SO_{2 (g)} + O_{2 (g)} ↔ 2SO_{3 (g)}

After the reactants and the product reach equilibrium and the initial temperature is restored, the flask is found to contain 0.30 mole of SO₃. Based on these results, the equilibrium constant, Kc, for the reaction is

• 20

• 10

• 6.7

• 0.93

Tags

NGSS.HS-PS1-7

What is the equation/reaction for this Kc expression?

• O₃ ⇌ 3O₂

• 2O₃ ⇌ 3O₂

• 2O₃ ⇌ O₂

• 3O₂ ⇌ 2O₃

Tags

NGSS.HS-PS1-7

The Kc expression for the reaction 2NH₃ ⇌ N₂ + 3H₂

• 
• 
• 
• 

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-6

NGSS.HS-PS1-7

At equilibrium, the concentrations of the products and reactants are constant over time.

• True

• False

Tags

NGSS.HS-PS1-6

NGSS.HS-PS1-7

An equilibrium constant, K_eq is defined as

• product concentrations - reactant concentrations

• reactant concentrations - product concentrations

• [reactant] / [product]

• [product] / [reactant]

In equilibrium reactions, we use the _________ as an exponent

• molar concentration

• products

• reactants

• number of moles

We do not include the following in equilibrium expressions:

• gases and liquids

• gases and aqueous solutions

• solids and aqueous solutions

• liquids and solids