A reaction vessel is charged with hydrogen iodide, which partially decomposes to molecular hydrogen and iodine: 2HI (g) H₂(g) + I₂(g)
When the system comes to equilibrium at 425 °C, P_HI = 0.708 atm, and PH₂ = PI₂ = 0.0960 atm. The value of K_p at this temperature is __________.

Question

A reaction vessel is charged with hydrogen iodide, which partially decomposes to molecular hydrogen and iodine: 2HI (g)

H₂(g) + I₂(g)
When the system comes to equilibrium at 425 °C, P_HI = 0.708 atm, and PH₂ = PI₂ = 0.0960 atm. The value of K_p at this temperature is __________.

Quizplus · Accepted Answer

At equilibrium, the expression for the equilibrium constant can be written as: K_p = PH₂ × PI₂ / P_HI^2 Substituting the given values: K_p = (0.0960 atm)^2 / (0.708 atm)^2 K_p = 1.84 × 10^-2 Therefore, the correct answer is D.

A Reaction Vessel Is Charged with Hydrogen Iodide, Which Partially