1. The value of Keq for the following reaction is 5.0 x 10-9 BaCO3(s) <--> Ba+2(

Question

1. The value of Keq for the following reaction is 5.0 x 10-9
BaCO3(s) <--> Ba+2(aq) + CO32-(aq)

What statement is most correct about the equilibrium reaction mixture?
products dominate
reactants dominate
There is a reasonable mixture of reactants and products
only products exist.
only reactants exist.

2.For the reaction FeO(s) + CO(g) Fe(s) + CO2(g),
-the usual expression for the equilibrium constant is [Fe][CO2]/[FeO][CO]
-addition of CO2(g) will increase Kc.
-increasing the volume of an equilibrium mixture at constant temperature will cause the number of moles of CO2 to increase as the mixture re-equilibrates.
-adding more FeO to an equilibrium mixture will cause the number of moles of CO2 to increase as the system re-equilibrates.
-None of the above statements is true

3. Kc for the reaction F2(g) + Cl2(g)<--> 2 FCl(g) equals 125 at a particular temperature. Suppose a system involving this reaction is already at equilibrium and the concentrations of F2 and Cl2 are found to be [F2] = 0.115 M and [Cl2] = 0.221 M. What is the concentration of FCl in the system?
[FCl] = 1.78 M
[FCl] = 3.17 M
[FCl] = 2.54 x 10-2 M
[FCl] = 1.43 x 10-2 M
None of the above is within 5% of the correct answer

4. At high temperatures one mole of hydrogen gas reacts with one mole of bromine gas to form hydrogen bromide. At a given temperature the equilibrium constant is 57.6. If at the same temperature, a mixture of 4.67 x 10-3 M hydrogen gas, 2.14 x 10-3 bromine gas, and 2.40 x 10-2 M hydrogen bromide gas is made, then
-the system is far from equilibrium and will shift to form more hydrogen gas.
-the system is far from equilibrium and will shift to form more hydrogen bromide gas.
-nothing can be deduced since we do not know whether the reaction is endothermic or exothermic.
-nothing can be deduced since we do not know whether the equilibrium constant is Kc or Kp.
-the system is at equilibrium.

5. Which one of the following equilibriums is least affected by a change in the volume of the system?
2 C(s) + O2(g) <--> 2 CO(g)
H2(g) + S(l) <---> H2S(g)
2 NO2(g)<--->N2O4(g)
H2O(l)<--->H2O(g)
2 NO(g) + Cl2(g)<-->2 NOCl(g)

Explanation / Answer

1. The value of Keq for the following reaction is 5.0 x 10-9
BaCO3(s) <--> Ba+2(aq) + CO32-(aq)
only reactants exist.

2.For the reaction FeO(s) + CO(g)---> Fe(s) + CO2(g),
-adding more FeO to an equilibrium mixture will cause the number of moles of CO2 to increase as the system re-equilibrates.


3. Kc for the reaction F2(g) + Cl2(g)<--> 2 FCl(g) equals 125 at a particular temperature. Suppose a system involving this reaction is already at equilibrium and the concentrations of F2 and Cl2 are found to be [F2] = 0.115 M and [Cl2] = 0.221 M. What is the concentration of FCl in the system?
[FCl] = 1.78 M


4. At high temperatures one mole of hydrogen gas reacts with one mole of bromine gas to form hydrogen bromide. At a given temperature the equilibrium constant is 57.6. If at the same temperature, a mixture of 4.67 x 10-3 M hydrogen gas, 2.14 x 10-3 bromine gas, and 2.40 x 10-2 M hydrogen bromide gas is made, then
-the system is far from equilibrium and will shift to form more hydrogen gas.

5. Which one of the following equilibriums is least affected by a change in the volume of the system?
H2O(l)<--->H2O(g)

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