Ch. 14 ap & 17 kinetics & equilibirum test [70 points] Chemistry

Show your work in an organized manner, includes any relevant equation / formula, proper units in your work / answer, and the proper number of significant figures in your answer.

1. In the reaction: SO 2 + O 2  -->  SO 3 ; if , then [10 points]

a.

 

b.

 

2. Write the algebraic expression for the equilibrium constant, K c, in the following chemical reaction. [10 points]

a. HCl (aq) + Ca(OH) 2 (aq) <-->  CaCl 2 (aq) + H 2O (l)

b. Na 2CO 3 (aq) + Cu(NO 3) 2 (aq) <-->  CuCO 3 (s) + NaNO 3 (aq)

3. The activation energy of a forward reaction is 75 kJ / mole and ∆H is 35 kJ/mole. Based on this information, [10 points]

a. sketch and label the reaction energy profile

b. calculate the activation energy of the backward reaction

 

4. The chemical reaction: H 2 (g) + I 2 (g)  <-->  2 HI (g)      ∆ H > 0 at equilibrium was disturbed by ___; what is the effect on [H 2] and[HI] ? Justify your answer. [15 points]

a. increase the volume of the system

b. cool the system

c. remove I 2

 

5. Determine the rate law (i.e. the value of the exponents & rate constant) of the reaction

N 2 (g) + 3 H 2(g) -->  2 NH 3 (g)

based on the following (hypothetical) experimental data. [15 points]

Experiment #

[N 2] (M)

[H 2] (M)

Rate (mM / second)

1

2.0

2.0

1.0

2

2.0

6.0

4.0

3

4.0

2.0

2.0

 

6. H 2 (g) + I 2 (g) <-->  2 HI (g)             K c = 9.0

Determine the equilibrium concentration of HI, if the initial concentration of H 2 and I 2 are 2.0 M, while the initial concentration of HI is 0. [10 points]