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Consider the following system at equilibrium where H° = 87.9 kJ, and Kc = 1.20×10-2, at 500 K. PCl5(g) PCl3(g) + Cl2(g) If the VOLUME of the equilibrium system is suddenly increased at constant temperature: 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. It is already at equilibrium. The number of moles of Cl2 will: A. increase. B. decrease. C. remain the same

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Hubert Koch
Hubert KochLv2
28 Apr 2020

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Related questions

Consider the following system at equilibrium where H° = -108 kJ, and Kc = 77.5, at 600 K. CO(g) + Cl2(g) COCl2(g)

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

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. It is already at equilibrium.

The number of moles of Cl2 will:

A. increase. B. decrease. C. remain the same.

1. Consider the following system at equilibrium where delta H° = 18.8 kJ, and Kc = 9.52×10-2, at 350 K.

CH4(g) + CCl4(g) inverse 2CH2Cl2(g)

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

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. It is already at equilibrium.
The number of moles of CCl4 will: A. increase.
B. decrease.
C. remain the same.

2. Consider the following system at equilibrium where delta H° = -18.8 kJ, and Kc = 10.5, at 350 K.

2CH2Cl2(g) inverse CH4(g) + CCl4(g)

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

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. It is already at equilibrium.
The number of moles of CCl4 will: A. increase.
B. decrease.
C. remain the same.

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

2NH3(g)--> N2(g) + 3H2(g)

If the TEMPERATURE on the equilibrium system is suddenly decreased:

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 restablish equilibrium.

C. Remain the same. Already at equilibrium.

4- The concentration of H2 will:

A. Increase.

B. Decrease.

C. Remain the same.

Consider the following system at equilibrium where H° = 198 kJ, and Kc = 2.90×10-2, at 1.15×103 K.

2SO3(g) --> 2SO2(g) + O2(g)

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

1- The value of Kc

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B. decreases.

C. remains the same.

2- The value of Qc

A. is greater than Kc.

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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 O2 will:

A. increase.

B. decrease.

C. remain the same.

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