Assignment
#5 from Chemistry CD ROM
Chemical Equilibrium
The following problems are very similar to Chapter 12 problems from the
CD ROM. Check out how those ones are solved and also read that chapter of the Study
Guide and the associated worked examples. We will use two classes this week to
work on the problems.
1. Balance the following equations and write the equilibrium expression for each.
A) SO2(G) + heat <=> S(G) + O2(G)
B) S(S) + O2(G) <=> SO2(G) + heat
C) SO3(G) + heat <=> SO2(G) + O2(G)
D) NH3(G) + O2(G)<=> NO(G) + H2O(G)
E) NO(G) <=> N2(G) + O2(G)
F) NO2(G) + H2(G) <=> NH3(G) + H2O(G)
G) C(S) + O2(G) <=> CO(G)
H) C(S) + O2(G) <=> CO2(G)
I) Fe3O4(S) + H2(G) <=> Fe(S) + H2O(G)
J) HCl(G) + O2(G) <=> H2O(G) + Cl2(G)
2. Describe the requested effect if the following stresses are applied on the above systems (Question A for reaction A above, etc.).
A) The effect on the oxygen concentration if the concentration of sulfur dioxide is decreased.
B) The effect on sulfur dioxide concentration if the temperature if increased.
C) The effect on the oxygen concentration if the temperature is increased.
D) The effect on the water concentration if the pressure is increased.
E) The effect on nitrogen concentration if the pressure is decreased.
3. For reaction 1E) the equilibrium concentrations of the substances are: 20M for oxygen and nitrogen and 0.50M for nitrogen monoxide. Calculate the equilibrium constant.
4. For reaction 1C) the equilibrium constant is 0.0050 at 700ēC. If the concentration of sulfur trioxide is 0.20M at equilibrium and the concentrations of sulfur dioxide and oxygen are equal to each other find the concentration of oxygen. Bonus: If I start with 0.20M of sulfur trioxide and no other substances find the equilibrium concentrations of everything.
5. In discussing the process of solvation we learned to write the dissolution equations for ionic solids. When considering the equilibrium of such processes we call the equilibrium constant the “solubility product” constant. It works just like the equilibrium constant! Write the solubility product expression for each of the following. (Note: the ionic compounds are solids and the ions are aqueous. Remember to balance first.)
A) AgCl <=> Ag+1 + Cl-1
B) Mg(OH)2 <=> Mg+2 + OH-1
C) AuCl3 <=> Au+3 + Cl-1
6. For each of the following, write the equation for the dissolving of it and the solubility product expression.
A) magnesium chloride
B) copper (II) sulfide
Bonus: If .01080 g of strontium carbonate (but no more) will dissolve in water to make 2.00 L of solution, what is the Ksp for strontium carbonate?