Worksheet: Reaction Quotients and Directions of Change

In this worksheet, we will practice predicting changes in the position of equilibrium by comparing reaction quotients with equilibrium constants.

Q1:

Sulfuryl chloride decomposes reversibly into chlorine and sulfur dioxide, as shown by the equation. SOCl()SO()+Cl()2222ggg

In one gas mixture, [SOCl]22 = 0.16 M, [Cl]2 = 0.13 M, and [SO]2 = 0.075 M. The value of 𝐾c for the reaction is 0.078. In which direction will the reaction shift in order to reach equilibrium?

  • ATo the left
  • BNeither; it has already reached equilibrium
  • CTo the right

Q2:

The reaction shown has 𝐾=4.50×10P at 720 K. N()+3H()2NH()223ggg

If, at this temperature, a reaction vessel is filled with each gas to the partial pressures listed, in which direction will it shift to reach equilibrium? P(NH)=93atm3, P(N)=48atm2, and P(H)=52atm2.

  • ATo the right
  • BTo the left
  • CNeither; it has reached equilibrium

Q3:

Consider the reaction shown, where 𝐾=0.050P, P(NO)=atm10.0, and P(N)=P(O)=atm225. N()+O()2NO()22ggg

What is the reaction quotient?

  • A𝑄=0.4P
  • B𝑄=2.5P
  • C𝑄=4.0P
  • D𝑄=0.25P

In which direction will the reaction proceed from this point?

  • ANeither: it has reached equilibrium.
  • BTo the left
  • CTo the right

Q4:

Consider the reaction shown, where 𝐾=4.6×10c, [NO]=1.00M, [Cl]=1.00M2, and [NOCl]=0M. 2NO()+Cl()2NOCl()ggg2

What is the reaction quotient?

  • A𝑄=0c
  • B𝑄=1.00c
  • C𝑄=2.00c
  • D𝑄=0.50c
  • E𝑄c undefined

In which direction will the reaction proceed from this point?

  • ANeither; it has reached equilibrium
  • BTo the left
  • CTo the right

Q5:

Consider the reaction shown, where 𝐾=16.5P, P(SO)=1.00atm3, P(SO)=1.00atm2, and P(O)=1.00atm2. 2SO()2SO()+O()322ggg

What is the reaction quotient?

  • A𝑄=2.50P
  • B𝑄=0.50P
  • C𝑄=2.00P
  • D𝑄=1.50P
  • E𝑄=1.00P

In which direction will the reaction proceed from this point?

  • ATo the right
  • BTo the left
  • CNeither; it has reached equilibrium

Q6:

Consider the reaction shown, where 𝐾=6.8×10P, P(NH)=3.0atm3, P(N)=2.0atm2, and P(H)=1.0atm2. 2NH()N()+3H()322ggg

If the partial pressures of all species are 1.0 atm under standard conditions, what is the reaction quotient for this reaction to two significant figures?

  • A𝑄=0.22P
  • B𝑄=0.89P
  • C𝑄=4.5P
  • D𝑄=0.67P
  • E𝑄=18P

In which direction will the reaction proceed from this point?

  • ATo the left
  • BNeither; it has reached equilibrium
  • CTo the right

Q7:

Consider the reaction shown, where 𝐾=17c, [NH]=0.20M3, [N]=1.00M2, and [H]=1.00M2. 2NH()N()+3H()322ggg

If the concentrations of all species are 1.00 M under standard conditions, what is the reaction quotient for this reaction?

  • A𝑄=0.20c
  • B𝑄=25c
  • C𝑄=5.0c
  • D𝑄=0.040c
  • E𝑄=0.45c

In which direction will the reaction proceed from this point?

  • ANeither; it has reached equilibrium
  • BTo the left
  • CTo the right

Q8:

For the reaction CO()+HO()CO()+H()gggg222c,𝐾=0.64, initial concentrations of the species are:

  • [CO]=0.0203M,
  • [HO]=0.0203M2,
  • [CO]=0.0040M2,
  • [H]=0.0040M2.

In which direction does the reaction shift in order to reach equilibrium?

  • ATo the left
  • BNeither; the reaction is already at equilibrium
  • CTo the right

Q9:

One of the important reactions in the formation of smog is represented by the following equation. CO()+HO()CO()+H()gggg222c𝐾=0.64 In which direction does the reaction shift in order to reach equilibrium?

  • ATo the left
  • BTo the right
  • CNeither; the reaction is already at equilibrium

Q10:

The initial concentrations of the species in a solution are as follows: [CO] = 0.0094 M, [HO]2 = 0.0025 M, [CO]2 = 0.0015 M, and [H]2 = 0.0076 M. These species participate in a reversible reaction represented by the following equation. CO()+HO()CO()+H()gggg222c,𝐾=0.64 In which direction does the reaction shift in order to reach equilibrium?

  • ATo the left
  • BTo the right
  • CNeither; the reaction is already at equilibrium

Q11:

An equilibrium is established according to the following equation. Hg()+NO()+3H()2Hg()+HNO()+HO(),22+3+2+22caqaqaqaqaql𝐾=4.6

What will happen in a solution that is 0.20 M each in Hg22+, NO3, H+, Hg2+, and HNO2?

  • AHg2+ will be reduced and HNO2 oxidized.
  • BHg2+ will be oxidized and HNO2 reduced.
  • CHg22+ will be oxidized and NO3 reduced.
  • DHg22+ will be reduced and NO3 oxidized.
  • EThere will be no change because all reactants and products have an activity of 1.

Q12:

One of the solubility rules is that all chlorides are soluble except HgCl22, AgCl, PbCl2, and CuCl.

Which of the following expressions correctly describes the equilibrium constant, 𝐾c, for the equilibrium shown? Pb()+2Cl()PbCl()2+2aqaqs

  • A𝐾1c
  • B𝐾0c
  • C𝐾=0c
  • D0<𝐾1c
  • E𝐾1c

Q13:

Benzene is one of the compounds used as octane enhancers in unleaded gasoline. It is manufactured by the catalytic conversion of acetylene to benzene. 3CH()CH()2266gg

Which value of 𝐾c would make this reaction most useful commercially?

  • A𝐾0c
  • B𝐾10c
  • C𝐾0.1c
  • D𝐾0.01c
  • E𝐾1c

Q14:

One of the solubility rules is that all chlorides are soluble except HgCl22, AgCl, PbCl2, and CuCl.

Which of the following expressions correctly describes the equilibrium constant, 𝐾c, for the equilibrium shown? AgCl()Ag()+Cl()saqaq+

  • A𝐾1c
  • B0<𝐾1c
  • C𝐾=0c
  • D𝐾0c
  • E𝐾1c

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