Chemistry 1 NO(g)+O3(g)O2(g)+NO2(g) Kc=6.010 to the 34 2 O2(g)2O(g) Kc=1.710 to the 8 3 N2(g)+3H2(g)2NH3(g) Kc=60 4 PCl5(g)PCl3(g)+Cl2(g)Kc=0.

0.40

Record all values with 3 digits. Include either a + or – sign.

5)

Consider the following equilibrium:

2NO2(g)⇋2NO(g)+O2(g)

Initially, 0.600 mol of NO2 is placed in a 1.00 L flask. At equilibrium, the concentration of NO was found to be 0.460 mol/L.

The equilibrium law expression would be

7) c

Consider the following equilibrium system

2CO(g)+O2(g)⇋2CO2(gKc=4.0×10−10

At equilibrium, this mixture contains

Select one:

3/5 reactants and 2/5 products

mostly products

equal amounts of reactants and products

mostly reactants

11) Consider the following equilibrium system:

CO(g)+H2O(g)⇆CO2(g)+H2(g) Kc=5.0

At equilibrium, a 2.0 L container was found to contain 0.20 mol of CO(g), 0.30 mol of H2O(g), and 0.90 mol of H2(g).

The equilibrium amount of carbon dioxide is calculated to be 

Answer

 mol.

12) Use the following information to answer the next question.

Consider the following equilibrium system:

CO(g)+Cl2(g)⇋COCl2(g) K=1.5×10 to the−3ΔrH=−108.3kJ

Which of the following changes would cause a change in the Kc value? 

Select one:

adding more reactants

increasing the pressure by decreasing the volume

heating or cooling the system

adding a catalyst

13) Consider the following equilibrium:

4HCl(g)+O2(g)⇆2H2O(g)+2Cl2(g) Kc=357

An equilibrium mixture of the above system was found to contain the following concentrations: HCl(g) = 0.35 mol/L, O2(g) = 0.078 mol/L and H2O(g) =1.2 mol/L. The equilibrium concentration of Cl2(g) is calculated to be 

Answer

 mol/L

14) Consider the following system:

2NO(g)+Cl2(g)⇋2NOCl(g)Kc=4.7×103

A sample mixture is tested and it is determined to contain all three entities in the following concentrations:

2NO(g)=0.53 mol/L

Cl2(g)=0.11 mol/L

2NOCl(g)=0.021 mol/L

From this information it can be inferred that the system

Select one:

is at equilibrium.

is not at equilibrium and the system needs to move in the reverse direction to reach equilibrium.

is not at equilibrium and the system needs to move in the forward direction to reach equilibrium.

is not at equilibrium but no further analysis can be done without knowing the initial concentrations.

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