The Equilibrium Constant, K_P, for the Reaction H₂(g) + I₂(g)

question 79

Multiple Choice

The equilibrium constant, K_P, for the reaction H₂(g) + I₂(g) 2HI(g) is 55.2 at 425°C.
A rigid cylinder at that temperature contains 0.127 atm of hydrogen, 0.134 atm of iodine, and 1.055 atm of hydrogen iodide. Is the system at equilibrium?

• A) Yes.
• B) No, the forward reaction must proceed to establish equilibrium.
• C) No, the reverse reaction must proceed to establish equilibrium.
• D) I need to know the volume of the container before deciding.
• E) Need to know the starting pressures of all substances before deciding.

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