In the Arrhenius equation, `k = A exp^(-Ea//RT)`, A may be termed as the rate constant at…………. .

Explanation

To solve the question regarding the Arrhenius equation, we need to analyze the equation and understand the significance of the term A in different scenarios.

### Step-by-Step Solution:

1. **Understanding the Arrhenius Equation**:
The Arrhenius equation is given by:
\[ k = A \exp\left(-\frac{E_a}{RT}\right) \]
where:
- \( k \) is the rate constant,
- \( A \) is the pre-exponential factor (also known as the frequency factor),
- \( E_a \) is the activation energy,
- \( R \) is the universal gas constant,
- \( T \) is the temperature in Kelvin.

2. **Analyzing the Scenario of Infinite Temperature**:
- As the temperature \( T \) approaches infinity, the term \(-\frac{E_a}{RT}\) approaches zero.
- Therefore, we can express this as:
\[ \lim_{T \to \infty} \exp\left(-\frac{E_a}{RT}\right) = \exp(0) = 1 \]
- Substituting this back into the Arrhenius equation gives:
\[ k = A \cdot 1 = A \]
- This indicates that at infinite temperature, the rate constant \( k \) equals the frequency factor \( A \).

3. **Analyzing the Scenario of Zero Activation Energy**:
- If we set the activation energy \( E_a \) to zero, the equation simplifies to:
\[ k = A \exp(0) = A \cdot 1 = A \]
- This shows that when the activation energy is zero, the rate constant \( k \) also equals the frequency factor \( A \).

4. **Conclusion**:
- From both scenarios analyzed (infinite temperature and zero activation energy), we conclude that:
- The term \( A \) in the Arrhenius equation can be termed as the rate constant at zero activation energy or at infinite temperature.

### Final Answer:
In the Arrhenius equation, \( k = A \exp\left(-\frac{E_a}{RT}\right) \), \( A \) may be termed as the rate constant at zero activation energy or at infinite temperature.

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