A) What is the value of K at 298K for the following reaction? (Please give your answer to two significant digits in scientific notation) K = enFE°/RT
3A2+(aq) + 2B(s)â 2B3+(aq) + 3A(s)
A2+(aq) + 2e- â A(s) E°red = â0.45 V
B3+(aq) + 3e- â B(s) E°red = â 0.75 V
B) Using the standard reduction potentials table in your book/notes, what is the standard change in gibbs free energy for the following reaction in kJ?
2NO3-(aq) + 8H+(aq) + 3Cu(s) â 3Cu2+(aq) + 2NO(g) + 4H2O(l)
If you took CHEM 122 lab here, this was the first reaction in the cycle of copper lab that released the brown NO gas.
C) What is the cell potential for the spontaneous concentration cell with the reaction Fe3+(aq) + Fe(s) â Fe(s) + Fe3+(aq), with concentrations of Fe3+ of 0.858M and 0.328M at a temperature of 310. K?
Ecell = E°cell â(RT/nF)lnQ
D)Which of the following will decrease the cell potential for the following reaction:
2Fe3+(aq) + 3Zn(s) â 3Zn2+(aq) + 2Fe(s)
Use the reaction Ecell = E°cell â (RT/nF)lnQ and consider how each manipulation affects Q and thus affects Ecell
Dilute the entire system
Remove water from the entire system
Add solid iron to the system
Increase concentration of Fe3+ in the solution
Increase the concentration of zinc ion in solution
Add zinc solid
A) What is the value of K at 298K for the following reaction? (Please give your answer to two significant digits in scientific notation) K = enFE°/RT
3A2+(aq) + 2B(s)â 2B3+(aq) + 3A(s)
A2+(aq) + 2e- â A(s) E°red = â0.45 V
B3+(aq) + 3e- â B(s) E°red = â 0.75 V
B) Using the standard reduction potentials table in your book/notes, what is the standard change in gibbs free energy for the following reaction in kJ?
2NO3-(aq) + 8H+(aq) + 3Cu(s) â 3Cu2+(aq) + 2NO(g) + 4H2O(l)
If you took CHEM 122 lab here, this was the first reaction in the cycle of copper lab that released the brown NO gas.
C) What is the cell potential for the spontaneous concentration cell with the reaction Fe3+(aq) + Fe(s) â Fe(s) + Fe3+(aq), with concentrations of Fe3+ of 0.858M and 0.328M at a temperature of 310. K?
Ecell = E°cell â(RT/nF)lnQ
D)Which of the following will decrease the cell potential for the following reaction:
2Fe3+(aq) + 3Zn(s) â 3Zn2+(aq) + 2Fe(s)
Use the reaction Ecell = E°cell â (RT/nF)lnQ and consider how each manipulation affects Q and thus affects Ecell
| Dilute the entire system | ||
| Remove water from the entire system | ||
| Add solid iron to the system | ||
| Increase concentration of Fe3+ in the solution | ||
| Increase the concentration of zinc ion in solution | ||
| Add zinc solid |
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