Question

At 850 K, the equilibrium constant for the reaction

Answer 1

Answer:

a) Q<Kc the reaction will shift to the right

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<K, it means 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.

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.