Equilibrium Constants

The following reaction :

SO_{2 (g)} + NO_{2 (g)} ⇌ SO_{3 (g)} + NO (g)

established equilibrium and was found to contain

0.40 M SO₃ , 0.30 M NO,

0.15 M NO₂ , and 0.20 M SO₂.

Calculate the equilibrium constant for this reaction.

• 4.0

• .42

• .25

• 1.0

A chemical reaction in which products can react to re-form reactants is known as a(n)

• reforming reaction

• reversible reaction.

• buffered reaction

• stoichiometric reaction.

Which statement describes this reaction at equilibrium?

• The concentration of N₂O₄(g) must equal the concentration of NO₂(g).

• The concentration of N₂O₄(g) and the concentration of NO₂(g) must be constant.

• The rate of the forward reaction is greater than the rate of the reverse reaction.

• The rate of the reverse reaction is greater than the rate of the forward reaction.

What states of matter are omitted when writing K_eq expressions?

• solids and liquids

• aqueous solutions and gas

• solids, liquids, aqueous solutions and gases

• aqueous solutions & liquids

When K_eq < 1,

• There are more products than reactants when the reaction reached equilibrium.

• There are more reactant than products when the reaction reached equilibrium.

• The amount of reactants is equal to the amount of products.

Tags

NGSS.HS-PS1-6

Calculate [H₂O] if K_eq = 1.2,

[CO₂] = 0.846M, and [CH₄]= 0.0713M

4CuO_(s) +CH_4(g) ⇌ CO_2(g)+4Cu_(s) +2H₂O_(g)

• 0.101 M

• 0.318 M

• 0.0102 M

• 3.77 M

Around what time does the reaction reach equilibrium?

• 25 min

• 70 min

• 45 min

• 80 min

Tags

NGSS.HS-PS1-5

Which of the two graphs reaches equilibrium?

• Neither

• The left

• Both

• The right

Tags

NGSS.HS-PS1-4

If the equilibrium constant is much less than one (K << 1) then

• Equilibrium is not established.

• Equilibrium lies to the right (products are favored)

• Equilibrium lies to the left (reactants are favored)

• Neither products or reactants are favored.

This symbol indicates that a reaction is ____________

• reversible

• irreversible