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3. A steel plate of area 100 cm² steel is undergoing a corrosion process resulting in a weight change of 2.89 x 10-5 gm/s. The equivalent current density associated with this process is a. 10 mA/cm² b. 1 mA/cm² c. 100 mA/cm² d. 0.10 mA/cm²

3. A steel plate of area 100 cm² steel is undergoing a corrosion process resulting in a weight change of 2.89 x 10-5 gm/s. The equivalent current density associated with this process is a. 10 mA/cm² b. 1 mA/cm² c. 100 mA/cm² d. 0.10 mA/cm²

Principles of Modern Chemistry
Principles of Modern Chemistry
8th Edition
ISBN:9781305079113
Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Chapter17: Electrochemistry
Section: Chapter Questions
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### Educational Content on Electrochemistry **Question 2:** In cyclic voltammetry, the effect of increasing the potential sweep rate, \(dE/dt\) (where \(t\) is time), is to: - a. increase the current density. - b. increase the rate of the corresponding oxidation/reduction process. - c. increase the charge transfer resistance. - d. all of the above. **Question 3:** A steel plate of area 100 cm\(^2\) is undergoing a corrosion process resulting in a weight change of 2.89 x 10\(^-5\) gm/s. The equivalent current density associated with this process is: - a. 10 mA/cm\(^2\) - b. 1 mA/cm\(^2\) - c. 100 mA/cm\(^2\) - d. 0.10 mA/cm\(^2\) **Question 4:** The thermodynamics of a passivation process can be examined using: - a. mixed potential theory or Evan’s diagrams. - b. Potential-pH or Pourbaix diagrams. - c. linear sweep voltammetry. - d. the electrochemical series of reduction potentials. **Question 5:** Consider the electrochemical cell: Cu/10\(^-4\) M Cu\(^{2+}\), 1M H\(^+\)/Pt/H\(_2\) (activity = 1). Determine the equilibrium potential versus the indicated reference electrode. - a. 0.342 V - b. 0.082 V - c. 0.222 V - d. 0.462 V
Transcribed Image Text:### Educational Content on Electrochemistry **Question 2:** In cyclic voltammetry, the effect of increasing the potential sweep rate, \(dE/dt\) (where \(t\) is time), is to: - a. increase the current density. - b. increase the rate of the corresponding oxidation/reduction process. - c. increase the charge transfer resistance. - d. all of the above. **Question 3:** A steel plate of area 100 cm\(^2\) is undergoing a corrosion process resulting in a weight change of 2.89 x 10\(^-5\) gm/s. The equivalent current density associated with this process is: - a. 10 mA/cm\(^2\) - b. 1 mA/cm\(^2\) - c. 100 mA/cm\(^2\) - d. 0.10 mA/cm\(^2\) **Question 4:** The thermodynamics of a passivation process can be examined using: - a. mixed potential theory or Evan’s diagrams. - b. Potential-pH or Pourbaix diagrams. - c. linear sweep voltammetry. - d. the electrochemical series of reduction potentials. **Question 5:** Consider the electrochemical cell: Cu/10\(^-4\) M Cu\(^{2+}\), 1M H\(^+\)/Pt/H\(_2\) (activity = 1). Determine the equilibrium potential versus the indicated reference electrode. - a. 0.342 V - b. 0.082 V - c. 0.222 V - d. 0.462 V
Expert Solution
Step 1: step 1 of 2

To calculate the equivalent current density associated with this process, we can use the following equation:

Currentdensity(mA/cm²)=(Weightchange(g/s))/(Molarmass(g/mol)∗Numberofelectronstransferred(mol/electron)∗Faradayconstant(C/mol∗electron))

Given:

  • Weight change (g/s) = 2.89 x 10⁻⁵ gm/s
  • Molar mass of iron (g/mol) = 55.845
  • Number of electrons transferred per iron atom (mol/electron) = 2
  • Faraday constant (C/mol * electron) = 96,485


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