Assessment Questions: 11 results 
Equilibrium : CommonIonEffect (9 Variations)
The molar solubility of lead(II) fluoride (PbF_{2}) is
2.1 x 10^{3} mol/L in pure water at 25^{o}C. What is the molar solubility of lead(II) fluoride in 0.10 M NaF at 25^{o}C? (Assume that the only relevant reaction is the solubilityproduct equilibrium.)
Equilibrium 
Chemometrics

Equilibrium : ConcFromKsp (8 Variations)
The K_{sp} of BaF_{2} is
1.7 x 10^{6} mol/L in water at 25^{o}C. What is the concentration of barium ions in equilibrium with solid barium fluoride? (Assume that the only relevant reaction is the solubilityproduct equilibrium.)
Equilibrium 
Chemometrics

Equilibrium : InterpretKsp (16 Variations)
Which of the following salts would give you the highest concentration of phosphate ions in solution if you placed 1 mole of the salt in a liter of water?
Equilibrium 
Chemometrics

Equilibrium : EqConstRelationships (12 Variations)
The equilibrium constant for the reaction of hydrogen gas and ethene to produce ethane under certain conditions is 9.8 x 10^{18}.
H_{2}(g) + C_{2}H_{4}(g)
C_{2}H_{6}(g) K = 9.8 x 10^{18}
What is the equilibrium constant for the following reaction under the same conditions?
C_{2}H_{6}(g)
H_{2}(g) + C_{2}H_{4}(g) K = ?
Equilibrium 
Chemometrics

Equilibrium : CalcMolesAtEquil (15 Variations)
The following reaction has an equilibrium constant of 0.083 at 900^{o}C.
COCl_{2}(g)
CO(g) + Cl_{2}(g)
If you have 1.00 mole of COCl_{2}(g) in a 1.00L container initially, how many moles of COCl_{2} will be present when the system reaches equilibrium?
Equilibrium 
Chemometrics

Equilibrium : EqConstConcData (4 Variations)
SbCl_{5}(g)
SbCl_{3}(g) + Cl_{2}(g)
You have 0.50 mol SbCl_{5} present initially in a 1.0L flask. The system is allowed to reach equilibrium at 450^{o}C. There is 0.10 mol Cl_{2} present at equilibrium. What is the equilibrium constant, K?
Equilibrium 
Chemometrics

Equilibrium : CalcRxnQuotient (13 Variations) In an experiment, 4.44 mol of SO_{2}, 7.93 mol of O_{2} and 4.03 mol of SO_{3} are placed in a 2.0L reaction vessel at a certain temperature. Calculate the reaction quotient, Q, for the reaction as written:
What is the calculated reaction quotient, Q? {2:NUMERICAL:=2.1e1:1e2#Correct! ~%50%2.1e1:5e2#Close but not quite right}
If K_{c} for this reaction at the temperature of the experiment is 3.7 x 10^{3}, will the reaction move toward the left or toward the right? {1:MULTICHOICE:left#Sorry, that's wrong.~=right#Correct!}
Equilibrium 
Chemometrics

Equilibrium : CalcKp (2 Variations)
In one experiment chemists studied the formation of phosgene, COCl_{2}, by mixing {y} atm of carbon monoxide and {z} atm of Cl_{2} in a reaction vessel at 700K. After the system reached equilibrium, the total pressure was {x} atm. Calculate Kp for the reaction.
Hint: Remember that the total pressure is the sum of all the partial pressures.
Note:
Do Not use scientific notation
DO NOT use spaces
DO NOT write in the units.
Be sure to write your answer with only one decimal place even if this is not the correct number of significant figures.
Equilibrium 
Chemometrics

Equilibrium : CalcKc (4 Variations)
A container initially has {y} M ammonia at a certain temperature. When the system reaches equilibrium the concentration of ammonia is {x} M. Calculate K_{c} for the following reaction as written.
Note:
Answers must be written using scientific notation with "e"
DO NOT use spaces
DO NOT write in the units.
Be sure to use three significant figures.
eg: 2.44e5
Equilibrium 
Chemometrics

Equilibrium : ConvertKcKp (6 Variations) Nitrosyl bromide is formed from nitrogen oxide and bromine:
K_{p} for this reaction is {x} at {y}°C. Calculate K_{c} at this temperature. (R = 0.0821 L atm/mol K)
Note: DO NOT use scientific notation Use integers (no decimal places) even is this is not the correct number of significant figures. DO NOT write in the units. eg: 18
Equilibrium 
Chemometrics

Equilibrium : MoreMolesAtEquil (19 Variations)
The following reaction has an equilibrium constant of 0.050 at a given temperature.
N_{2}(g)+ O_{2}(g)
2NO(g)
If you have 0.75 moles of N_{2}(g) and 0.75 moles of O_{2}(g) in a 2.0L container initially, how many moles of N_{2} will be present when the system reaches equilibrium?
Equilibrium 
Chemometrics
