Consider the following system at equilibrium where AH° = 111 kJ, and K, = 6.30, at 723 K. 2NH3(g) EN2(g) + 3H2(g) If the VOLUME of the equilibrium system is suddenly decreased at constant temperature: The value of K. |A. increases. B. decreases.

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**Equilibrium System Analysis**

Consider the following system at equilibrium where ΔH° = 111 kJ, and Kc = 6.30, at 723 K:

\[ 2\text{NH}_3(g) \rightleftharpoons \text{N}_2(g) + 3\text{H}_2(g) \]

If the **VOLUME** of the equilibrium system is suddenly **decreased** at constant temperature:

1. **The value of Kc:**  
   - A. increases.  
   - B. decreases.  
   - C. remains the same.

2. **The value of Qc:**  
   - A. is greater than Kc.  
   - B. is equal to Kc.  
   - C. is less than Kc.

3. **The reaction must:**  
   - A. run in the forward direction to reestablish equilibrium.  
   - B. run in the reverse direction to reestablish equilibrium.  
   - C. remain the same. It is already at equilibrium.

4. **The number of moles of H2 will:**  
   - A. increase.  
   - B. decrease.  
   - C. remain the same.

**Understanding Equilibrium Shifts:**

- **Volume Decrease:** Decreasing the volume increases the pressure, causing the system to shift towards the side with fewer moles of gas to minimize pressure.
  
- **Relationship of Qc and Kc:** Qc is compared to Kc to determine which direction the reaction will shift to reach equilibrium again.

**Conclusion:** For this endothermic reaction, changes in external conditions can shift the equilibrium, and understanding how these factors affect Kc, Qc, and the direction of the reaction is crucial for predicting the system's response.
Transcribed Image Text:**Equilibrium System Analysis** Consider the following system at equilibrium where ΔH° = 111 kJ, and Kc = 6.30, at 723 K: \[ 2\text{NH}_3(g) \rightleftharpoons \text{N}_2(g) + 3\text{H}_2(g) \] If the **VOLUME** of the equilibrium system is suddenly **decreased** at constant temperature: 1. **The value of Kc:** - A. increases. - B. decreases. - C. remains the same. 2. **The value of Qc:** - A. is greater than Kc. - B. is equal to Kc. - C. is less than Kc. 3. **The reaction must:** - A. run in the forward direction to reestablish equilibrium. - B. run in the reverse direction to reestablish equilibrium. - C. remain the same. It is already at equilibrium. 4. **The number of moles of H2 will:** - A. increase. - B. decrease. - C. remain the same. **Understanding Equilibrium Shifts:** - **Volume Decrease:** Decreasing the volume increases the pressure, causing the system to shift towards the side with fewer moles of gas to minimize pressure. - **Relationship of Qc and Kc:** Qc is compared to Kc to determine which direction the reaction will shift to reach equilibrium again. **Conclusion:** For this endothermic reaction, changes in external conditions can shift the equilibrium, and understanding how these factors affect Kc, Qc, and the direction of the reaction is crucial for predicting the system's response.
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