Question

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

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 O2 will:

A. increase.

B. decrease.

C. remain the same.