Last modified: Mon 04/21/2014 04:29:50 pm
ACA

Oklahoma State University

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Answer all of the questions below. If you do not know an answer enter CNA. However, it will help me the most if you answer each question with your best intuition/idea about what would be a reasonable answer.


First Name:

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Laboratory Section:

 

1. Given the reaction

2NO(g) + Br2(g) 2NOBr(g)

a) Write the equilibrium expression for the reaction.

Kc =

2. The magnitude for the equilibrium constant for this reaction is 4.17.

a) look at the equilibrium expression and the chemical equation; which side, the reactants or the products will have the larger concentration(s) at equilibrium?

Briefly, explain your reasoning

3a. Given the magnitude of the equilibrium constant for the reaction in Q1 is 4.17, calculate the value (magnitude) of K for the reaction,

2NOBr(g) 2NO(g) + Br2(g)

K =

b) Calculate the value (magnitude) of K for the reaction,

NO(g) + 1/2Br2(g) NOBr(g)

K =

4. A vessel initially has a concentration of NO equal to 0.526 M and a concentration of Br2 equal to 0.329 M. An ICE table has been constructed based on this information.

 
2NO(g)
+ Br2(g)
2NOBr(g)

Initial Concentration

0.526 M

0.329 M

0 M

Change

     

Equilibrium Concentration

     

a) When the reaction is allowed to proceed to equilibrium the concentration of Br2 is found to be 0.203 M. Calculate the concentration of Br2 reacting and enter the number in the field in the ICE table below.

 

2NO(g)

+ Br2(g)

2NOBr(g)

Initial Concentration

0.526 M

0.329 M

0 M

Change

 

M

 

Equilibrium Concentration

 

0.203 M

 

b) Based on your answer in Q4a calculate the concentration of NO reacting and the concentration of NOBr forming and enter the numbers in the fields in the ICE table below.

 

2NO(g)

+ Br2(g)

2NOBr(g)

Initial Concentration

0.526 M

0.329 M

0 M

Change

M

 

M

Equilibrium Concentration

 

0.203 M

 

c) Based on your answer in Q4a and Q4b calculate the equilibrium concentrations of NO and NOBr and enter the concentrations in the fields in the ICE table below.

 

2NO(g)

+ Br2(g)

2NOBr(g)

Initial Concentration

0.526 M

0.329 M

0 M

Change

 

 

 

Equilibrium Concentration

M

0.203 M

M

d) Calculate KC for the reaction

5. Is there anything about the questions that you feel you do not understand? List your concerns/questions.

6. If there is one question you would like to have answered in lecture, what would that question be?