At 850 K, the equilibrium constant for the reaction

2SO2 (g) + O2 (g) ⇌2SO3 (g) Kc=15.

If the given concentrations of the three gases are mixed, predict in which direction the net reaction will proceed toward equilibrium. Left No net reaction Right

a. [SO2] = 0.60 M, [O2] = 0.70 M, [SO3] = 0.16 M

b. [SO2] = 0.20 M, [O2] = 0.60 M, [SO3] = 0.60 M

c. [SO2] = 0.10 M, [O2] = 0.20 M, [SO3] = 0.40 M

Question

Isai Arnold

Chemistry

7 April, 10:21

At 850 K, the equilibrium constant for the reaction

2SO2 (g) + O2 (g) ⇌2SO3 (g) Kc=15.

If the given concentrations of the three gases are mixed, predict in which direction the net reaction will proceed toward equilibrium. Left No net reaction Right

a. [SO2] = 0.60 M, [O2] = 0.70 M, [SO3] = 0.16 M

b. [SO2] = 0.20 M, [O2] = 0.60 M, [SO3] = 0.60 M

c. [SO2] = 0.10 M, [O2] = 0.20 M, [SO3] = 0.40 M

+5

Answers (1)

Know the Answer?

Spears · Answer 1

a) Q
b) Q=Kc the reaction is at the equilibrium

c) Q>Kc the reaction will shift to the left

Explanation:

Step 1: Data given

temperature = 850 K

Kc = 15

When Q=K, the system is at equilibrium. Since the system is already at equilibrium, there will no shift to left or right happen.

When Q>K, it means we have more products than reactants. As reaction, the amount of products will decrease, and produce more reactants. in other words, the reaction will shift to the left.

When Q
Step 2: The balanced equation

2SO2 (g) + O2 (g) ⇌2SO3 (g) Kc=15

Step 3: Calculate Q

Q = [SO3]²/[O2][SO2]²

a. [SO2] = 0.60 M, [O2] = 0.70 M, [SO3] = 0.16 M

Q = 0.16²/0.70*0.60²

Q = 0.10

Q << Kc

we have more reactants than products. As reaction, the amount of reactants will decrease, and will produce more products. In other words, the reaction will shift to the right.

b. [SO2] = 0.20 M, [O2] = 0.60 M, [SO3] = 0.60 M

Q = 0.60²/0.60*0.20²

Q = 15

Q=K, the system is at equilibrium. Since the system is already at equilibrium, there will no shift to left or right happen.

c. [SO2] = 0.10 M, [O2] = 0.20 M, [SO3] = 0.40 M

Q = 0.40²/0.20*0.10²

Q = 80

Q>K, it means we have more products than reactants. As reaction, the amount of products will decrease, and produce more reactants. in other words, the reaction will shift to the left.