AP Chemistry : Thermodynamics
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Example Questions
Example Question #71 : Thermodynamics
Using the following data to calculate the enthalpy change in: C4H10O(l) -> C4H8 (g) + H2O (g)
152 kJ/mol
-152 kJ/mol
-17 kJ/mol
-76 kJ/mol
76 kJ/mol
76 kJ/mol
Example Question #122 : Thermochemistry And Kinetics
Using the following data to calculate the enthalpy change in: CaO (s) + H2O (l) -> Ca(OH)2 (aq)
-147 kJ/mol
-62 kJ/mol
124 kJ/mol
147 kJ/mol
-124 kJ/mol
-147 kJ/mol
Example Question #123 : Thermochemistry And Kinetics
Using the following data to calculate the enthalpy change in: B2H6 (g) + 3 O2 (g) -> B2O3 (s) + 3 H2O (l)
1084 kJ/mol
3252 kJ/mol
-2168 kJ/mol
2168 kJ/mol
-1084 kJ/mol
-2168 kJ/mol
Example Question #124 : Thermochemistry And Kinetics
Consider an electrochemical cell that has the following overall reaction:
2 H+(aq) + Sn (s) -> Sn2+ (aq) + H2 (aq)
Which of the following changes would alter the measured cell potential?
Increasing the H2 pressure in the cathode.
Lowering the pH in the cathode.
All of the above.
Increase the pH in the cathode.
Adding SnCl2 to the cathode.
All of the above.
All of these changes would change Q and thus change the measured cell potential.
Example Question #125 : Thermochemistry And Kinetics
For the following cell reaction:
2 Al (s) + 3 Mn2+ (aq) -> 2 Al3+ (aq) + 3 Mn (s)
predict if the cell potential Ecell will be larger, or smaller than Eocell for the following conditions:
[Al3+] = 2.0 M; [Mn2+] = 1.0 M.
Smaller
Larger
Can not be determined
Identical
Smaller
Altering these conditions would increase Q, and thus result in a decrease in the measured cell potential.
Example Question #126 : Thermochemistry And Kinetics
For the following cell reaction:
2 Al (s) + 3 Mn2+ (aq) -> 2 Al3+ (aq) + 3 Mn (s)
predict if the cell potential Ecell will be larger, or smaller than Eocell for the following conditions: [Al3+] = 1.0 M; [Mn2+] = 5.0 M.
Identical
Larger
Smaller
Can not be determined
Larger
At these concentrations Q will become smaller, and thus log Q will become smaller. This will give rise to a larger cell potential.
Example Question #71 : Thermodynamics
What is the cell potential of the following cell:
Zn (s) + 2 H+(aq) -> Zn2+ (aq) + H2 (g) Eo = 0.76 V
When the [Zn2+] = 1.0 M; PH2 = 1 atm, and the pH in the cathode is 5.2?
1.80 V
1.59 V
0.90 V
0.45 V
1.32 V
0.45 V
Example Question #72 : Thermodynamics
Calculate the standard cell potential of the following reaction:
Cd(s) + MnO2 (s) + 4 H+ (aq) + -> Cd2+ (aq) + Mn2+ (aq) + 2 H2O (l)
Given:
MnO2 (s) + 4 H+ (aq) + 2e- -> Mn2+ (aq) + 2 H2O (l) Eo = 1.23 V
Cd2+ (aq) + 2 e- -> Cd (s) Eo = -0.40 V
-1.63 V
-0.83 V
0.0 V
0.83 V
1.63 V
1.63 V
Eocell = Eo cathode - Eoanode
Eocell = 1.23 – (-0.40) = 1.63 V
Example Question #129 : Thermochemistry And Kinetics
Calculate the standard cell potential of the following reaction:
Zn (s) + Cu2+ (aq) -> Zn2+ (aq) + Cu (s)
Given:
Zn2+(aq)+ 2 e--> Zn (s) Eo = -0.76 V
Cu2+(aq)+ 2 e--> Cu (s) Eo = 0.34 V
-0.42 V
0.42 V
1.10 V
0.0 V
-1.10 V
1.10 V
Eocell = Eo cathode - Eoanode
Eocell = 0.34 – (-0.76) = 1.10 V
Example Question #130 : Thermochemistry And Kinetics
Calculate the standard cell potential of the following reaction:
Zn (s) + 2 Ag1+ (aq) -> Zn2+ (aq) + 2 Ag (s)
Given:
Zn2+(aq)+ 2 e--> Zn (s) Eo = -0.76 V
Ag1+(aq)+ 1 e--> Ag (s) Eo = 0.80 V
2.36 V
1.56 V
-1.56 V
0.04 V
-0.04 V
1.56 V
Eocell = Eo cathode - Eoanode
Eocell = 0.80 – (-0.76) = 1.56 V
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