Name: ______________________________ date: _____________

 

ch. 17 Equilibrium test [100 points] Chemistry

 

 

Show your work, including equation / formula, proper units in your work / answer, proper number of significant figures in your answer, and circle your answer.

 

 

1. Determine the equilibrium concentrations of all chemicals in the reaction:

 

H2 (g) + F2 (g) 2 HF (g) Kc = 36

 

where the initial: [H2] = 2.0 mM; [F2] = 4 mM; [HF] = 20.0 mM. [25 points]

 

 

2. Determine the equilibrium concentrations of all chemicals in the reaction:

 

H2 (g) + I2 (g) 2 HI (g) Kp = 81 * 10-4 T = 300 K

 

where the initial partial pressures: H2 = 800 torr; I2 = 1500 torr; HI = 1000 torr. [25 points].

 

 

3. Determine the change in the [N2] and [NH3] in the following reaction: [25 points]

 

2 N2 (g) + 6 H2 (g) 4 NH3 (g) H > 0

 

at equilibrium, that was disturbed by the following events (and justify / rationalize your answer)

 

a.       increase in volume

 

b.      increase in temperature

 

c.       remove H2

 

d.      add Ne

 

e.       adding a catalyst

 

4. Write the (algebraic) expression for Kc or Kp in the following chemical reactions: [25 points]

 

a.       CaCO3 (s) CaO (s) + CO2 (g)

 

b.      CH3COOH (aq) + H2O (l) H3O+ (aq) + CH3COO- (aq)

 

c.       Ag+ (aq) + Cl -(aq) AgCl (s)

 

 

d.      N2 (g) + 3/2 H2 (g) NH3 (g)

 

 

e. CH3CH3 (g) + O2 (g) CO2 (g) + H2O (g)

 

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