1. Suppose that a catalyst lowers the activation barrier of a reaction from 125 kJ/mol to 55 kJ/mol. By what factor would you expect the reaction rate to increase at 25°C? (Assume the frequency factors for the catalyzed and uncatalyzed reactions are identical.)
1. Suppose that a catalyst lowers the activation barrier of a reaction from 125 kJ/mol to 55 kJ/mol. By what factor would you expect the reaction rate to increase at 25°C? (Assume the frequency factors for the catalyzed and uncatalyzed reactions are identical.)
Chapter18: Electrochemistry
Section: Chapter Questions
Problem 83E: Consider a concentration cell that has both electrodes made of some metal M. Solution A in one...
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![1. Suppose that a catalyst lowers the activation
barrier of a reaction from 125 kJ/mol to 55 kJ/mol.
By what factor would you expect the reaction rate
to increase at 25°C? (Assume the frequency
factors for the catalyzed and uncatalyzed reactions
are identical.)
2. A Fe³+/Fe half-cell and Sn²+/Sn half-cell under
standard state conditions are connected by a wire
and a 0.1 M NaNO3 salt bridge (assume 298
K).
a. Sketch this galvanic cell with beakers,
indicating the direction of electron flow and
ion flow from the salt bridge.
b. Write the anode and cathode half-reactions as
well as the balanced equation for the redox
reaction occurring for the galvanic cell.
c. Use the shorthand line notation to represent
the electrochemical cell.
cell
d. Calculate Eº for the reaction occurring in
this galvanic cell (use standard reduction
potentials in the appendix of the Zumdahl
textbook).
e. Calculate AG° (in kJ/mol) for this reaction
using the equation:
AG=-nFE°
cell
f. Calculate the Ecell when [Fe³+]= 2.00 M and
[Sn²+]= 1.5 x 10-³.
g. Calculate the Kc for the galvanic cell.
3. If th molar solubility of Pd(SCN)₂= 2.22 x 10-8 M,
what is the Ksp for Pd(SCN)₂?
4. Circle all of the following that will be more
soluble in acidic solution than in pure water.
Justify your choices.
a. Hg₂Cl₂
b. SrF₂
c. Mg(OH)₂](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fa7634a6a-5ecc-40e2-9892-46ba7a4cefd4%2Fcf12daf6-cc8a-4d0a-aed2-16fd2fcbf636%2Fyafv6vg_processed.jpeg&w=3840&q=75)
Transcribed Image Text:1. Suppose that a catalyst lowers the activation
barrier of a reaction from 125 kJ/mol to 55 kJ/mol.
By what factor would you expect the reaction rate
to increase at 25°C? (Assume the frequency
factors for the catalyzed and uncatalyzed reactions
are identical.)
2. A Fe³+/Fe half-cell and Sn²+/Sn half-cell under
standard state conditions are connected by a wire
and a 0.1 M NaNO3 salt bridge (assume 298
K).
a. Sketch this galvanic cell with beakers,
indicating the direction of electron flow and
ion flow from the salt bridge.
b. Write the anode and cathode half-reactions as
well as the balanced equation for the redox
reaction occurring for the galvanic cell.
c. Use the shorthand line notation to represent
the electrochemical cell.
cell
d. Calculate Eº for the reaction occurring in
this galvanic cell (use standard reduction
potentials in the appendix of the Zumdahl
textbook).
e. Calculate AG° (in kJ/mol) for this reaction
using the equation:
AG=-nFE°
cell
f. Calculate the Ecell when [Fe³+]= 2.00 M and
[Sn²+]= 1.5 x 10-³.
g. Calculate the Kc for the galvanic cell.
3. If th molar solubility of Pd(SCN)₂= 2.22 x 10-8 M,
what is the Ksp for Pd(SCN)₂?
4. Circle all of the following that will be more
soluble in acidic solution than in pure water.
Justify your choices.
a. Hg₂Cl₂
b. SrF₂
c. Mg(OH)₂
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