3) The value of Keq for the equilibrium H2 (g) + I2 (g) 2 HI (g) is 54.0 at 427 °C. What is the value of Keq for the equilibrium below? HI (g) 1/2 H2 (g) + 1/2 I2 (g)

The equilibrium constant for this reaction is 0.136

Explanation:

Step 1: Data given

H2 (g) + I2 (g) ⇆ 2 HI (g) Kc = 54.0

Temperature = 427 °C

Step 2: The balanced equation

HI (g) ⇆ 1/2 H2 (g) + 1/2 I2 (g)

Step 3: Calculate Kc for 1/2H2 (g) + 1/2I2 (g) ⇆ HI

Kc' = √ (Kc)

Kc' = √ (54.0)

Kc' = 7.35

Step 4: Calculate Kc for HI (g) ⇆ 1/2 H2 (g) + 1/2 I2 (g)

Kc" = 1/Kc'

Kc" = 1 / 7.35

Kc" = 0.136

The equilibrium constant for this reaction is 0.136