Questions...

Can you explain these two questions? Thanks!
9. Which of the following cannot be explained by LeChatelier’s Principle?
a. Removal of a gaseous product from a reaction drives the reaction to completion.
b. Any salt will dissolve in water, even though the amount might be extremely small.
c. The activation energy of a reverse chemical process is related to the activation energy and
ΔH of the forward process.
d. Less of a salt will dissolve in a solution that has a “common ion” than in pure water.
e. The equilibrium of an exothermic process will be more reactant-favored at higher
temperatures

"a" - removing a product will drive an equilibrium toward products, that's almost the definition of LeChatelier's Principle (I'll call it LCP from here on...)
"b" - Think about solubility in terms of a chemical reaction/equilibrium, salt + water yields ions in solution. Water acts as a reactant here, so adding more water will stress the equilibrium and shift it toward products.
"c" - This is purely kinetics, so it'd be tough to explain it with LCP.
"d" - Again, think about solubility as an equilibrium. NaCl(s) <-> Na⁺(aq) + Cl^-(aq). If you use a "solvent" that already has a bunch of chloride ions dissolved in it, it will push the equilibrium left.
"e" - for an exothermic process, "heat" is a product of the reaction. If you add a product, the equilibrium will shift toward reactants.

14. You have found the following value in a table of equilibrium constants at 25ºC:
3 O2(g) 􀀧 2 O3(g) Kc = 6.25x10-58
2 NO(g) + O2(g) 􀀧 2 NO2(g) Kc = 2.25x1012
What is the equilibrium constant for the reaction:
NO(g) + O3(g) 􀀧 NO2(g) + O2(g)
a. 3.60x1069
b. 1.41x10-45
c. 2.03x1053
d. 6.00x1034
e. 9.38x10-52

How do we have to rearrange the two given reactions so they add up to the final reaction? Looks like the first rxn has to be reversed and multiplied by 0.5, so the "adjusted" equilibrium constant for that step is (1/K_c1)^0.5. The second rxn has to be multiplied by 0.5, so the "adjusted" equilibrium constant is K_c2^0.5. Therefore, the equilibrium constant for the final rxn is: (1/K_c1)^0.5 K_c2^0.5 = 6x10³⁴. {Just a note in case you're having a bad math day, raising something to the 0.5 power is the same as taking the square root...}

I'll answer any other questions first thing in the morning.