Question

Consider the following system at equilibrium where ?H° = -87.9 kJ, and Kc = 83.3 , at 500 K: PCl3 (g) + Cl2 (g) ? PCl5 (g) If the TEMPERATURE on the equilibrium system is suddenly decreased : The value of Kc A. Increases B. Decreases C. Remains the same The value of Qc A. Is greater than Kc B. Is equal to Kc C. Is less than Kc 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. Already at equilibrium. The concentration of Cl2 will: A. Increase. B. Decrease. C. Remain the same.

          Consider the following system at equilibrium where ?H° = -87.9 kJ, and Kc = 83.3 , at 500 K:

PCl3 (g) + Cl2 (g) ? PCl5 (g)

If the TEMPERATURE on the equilibrium system is suddenly decreased :

The value of Kc A. Increases
B. Decreases
C. Remains the same

The value of Qc A. Is greater than Kc
B. Is equal to Kc
C. Is less than Kc

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. Already at equilibrium.

The concentration of Cl2 will: A. Increase.
B. Decrease.
C. Remain the same.

Show more…

Consider the following system at equilibrium where ?H° = -87.9 kJ, and Kc = 83.3 , at 500 K:

PCl3 (g) + Cl2 (g) ? PCl5 (g)

If the TEMPERATURE on the equilibrium system is suddenly decreased :

The value of Kc A. Increases
B. Decreases
C. Remains the same

The value of Qc A. Is greater than Kc
B. Is equal to Kc
C. Is less than Kc

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. Already at equilibrium.

The concentration of Cl2 will: A. Increase.
B. Decrease.
C. Remain the same.

Added by Diego H.

Chemistry: Structure and Properties

Nivaldo Tro 2nd Edition

Instant Answer

Solved by Expert Adi S

09/10/2023

Step 1

When the temperature is decreased, according to Le Chatelier's principle, the system will shift in the direction that absorbs heat. Since the reaction is exothermic (ΔH = -87.9 kJ), the system will shift to the left (reverse direction) to absorb heat. Show more…

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Consider the following system at equilibrium where ΔH° = -87.9 kJ, and Kc = 83.3, at 500 K: PCl3 (g) + Cl2 (g) ⇌ PCl5 (g) If the TEMPERATURE on the equilibrium system is suddenly decreased: The value of Kc A. Increases B. Decreases C. Remains the same The value of Qc A. Is greater than Kc B. Is equal to Kc C. Is less than Kc 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. Already at equilibrium. The concentration of Cl2 will: A. Increase. B. Decrease. C. Remain the same.

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