The rate constant k for a certain reaction is measured at two different temperatures: temperature k 74.0 °C |9.8 × 1012| 197.0 °C 9.6 × 1015| Assuming the rate constant obeys the Arrhenius equation, calculate the activation energy E̟ for this reaction. Round your answer to 2 significant digits. --0 kJ E = mol ?

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### Calculating the Activation Energy Using the Arrhenius Equation

**Problem Statement:**

The rate constant \( k \) for a certain reaction is measured at two different temperatures:

| Temperature (°C) | \( k \)                          |
|------------------|----------------------------------|
| 74.0 °C          | \( 9.8 \times 10^{12} \)         |
| 197.0 °C         | \( 9.6 \times 10^{15} \)         |

**Objective:**

Assuming the rate constant obeys the Arrhenius equation, calculate the activation energy \( E_a \) for this reaction.

**Instructions:**

1. Use the given temperatures and rate constants to calculate the activation energy.
2. Round your answer to 2 significant digits.

**Formula to Use:**

The Arrhenius equation is given by:

\[ k = A \cdot e^{-\frac{E_a}{RT}} \]

Where:
- \( k \) is the rate constant
- \( A \) is the pre-exponential factor
- \( E_a \) is the activation energy
- \( R \) is the universal gas constant (8.314 J/(mol·K))
- \( T \) is the temperature in Kelvin

To solve for \( E_a \), we use the equation:

\[ \ln\left(\frac{k_2}{k_1}\right) = \frac{E_a}{R} \left(\frac{1}{T_1} - \frac{1}{T_2}\right) \]

**Graph Explanation:**

No graphs are provided in this problem. Only tabulated data for temperatures and rate constants are given.

**Calculation Panel:**

The panel below allows you to enter your calculated value for \( E_a \) in kJ/mol.

\[ E_a = \boxed{} \ \text{kJ/mol} \]

(Use the input box for calculations and rounding utilities.)

Ensure to convert the activation energy from J/mol to kJ/mol by dividing by 1000. Finally, remember to round off to 2 significant digits.
Transcribed Image Text:### Calculating the Activation Energy Using the Arrhenius Equation **Problem Statement:** The rate constant \( k \) for a certain reaction is measured at two different temperatures: | Temperature (°C) | \( k \) | |------------------|----------------------------------| | 74.0 °C | \( 9.8 \times 10^{12} \) | | 197.0 °C | \( 9.6 \times 10^{15} \) | **Objective:** Assuming the rate constant obeys the Arrhenius equation, calculate the activation energy \( E_a \) for this reaction. **Instructions:** 1. Use the given temperatures and rate constants to calculate the activation energy. 2. Round your answer to 2 significant digits. **Formula to Use:** The Arrhenius equation is given by: \[ k = A \cdot e^{-\frac{E_a}{RT}} \] Where: - \( k \) is the rate constant - \( A \) is the pre-exponential factor - \( E_a \) is the activation energy - \( R \) is the universal gas constant (8.314 J/(mol·K)) - \( T \) is the temperature in Kelvin To solve for \( E_a \), we use the equation: \[ \ln\left(\frac{k_2}{k_1}\right) = \frac{E_a}{R} \left(\frac{1}{T_1} - \frac{1}{T_2}\right) \] **Graph Explanation:** No graphs are provided in this problem. Only tabulated data for temperatures and rate constants are given. **Calculation Panel:** The panel below allows you to enter your calculated value for \( E_a \) in kJ/mol. \[ E_a = \boxed{} \ \text{kJ/mol} \] (Use the input box for calculations and rounding utilities.) Ensure to convert the activation energy from J/mol to kJ/mol by dividing by 1000. Finally, remember to round off to 2 significant digits.
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