An object is electroplated with rhodium for 28.2 minutes at current of 1.4 A. Rh3+ + 3 e Rh Molar mass Rh = 102.9 g/mol F = 96,485.34 C/mol e A = C/s Given the information above, calculate how many grams of rhodium should theoretically be plated on the object.

Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
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**Electroplating with Rhodium: Calculation Exercise**

White gold is regular gold electroplated with rhodium. In this exercise, you will calculate the amount of rhodium theoretically plated on an object.

**Scenario:**

An object is electroplated with rhodium for 28.2 minutes at a current of 1.4 A.

- **Chemical Equation:**  
  \[ \text{Rh}^{3+} + 3 \text{e}^- \rightarrow \text{Rh} \]

- **Molar Mass of Rhodium (Rh):**  
  102.9 g/mol

- **Faraday's Constant (F):**  
  96,485.34 C/mol e^-

- **Formula:**  
  \[ \text{A} = \text{C/s} \]

**Task:**

Using the information provided, calculate how many grams of rhodium should theoretically be plated on the object.

**Instructions:**

When entering your answer, ensure the following:

- Enter the number only (no units).
- Do not leave any spaces.
- Use a leading zero before the decimal if necessary.
- Report your number to three decimal places, regardless of significant figures.
- Correctly round your answer to the third decimal place (the margin of allowed error is ±0.001, so always use unrounded numbers in your calculations).

**Examples:**

- Correct: 0.123 or 9.876
Transcribed Image Text:**Electroplating with Rhodium: Calculation Exercise** White gold is regular gold electroplated with rhodium. In this exercise, you will calculate the amount of rhodium theoretically plated on an object. **Scenario:** An object is electroplated with rhodium for 28.2 minutes at a current of 1.4 A. - **Chemical Equation:** \[ \text{Rh}^{3+} + 3 \text{e}^- \rightarrow \text{Rh} \] - **Molar Mass of Rhodium (Rh):** 102.9 g/mol - **Faraday's Constant (F):** 96,485.34 C/mol e^- - **Formula:** \[ \text{A} = \text{C/s} \] **Task:** Using the information provided, calculate how many grams of rhodium should theoretically be plated on the object. **Instructions:** When entering your answer, ensure the following: - Enter the number only (no units). - Do not leave any spaces. - Use a leading zero before the decimal if necessary. - Report your number to three decimal places, regardless of significant figures. - Correctly round your answer to the third decimal place (the margin of allowed error is ±0.001, so always use unrounded numbers in your calculations). **Examples:** - Correct: 0.123 or 9.876
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