For the reaction 2HI ____________> H2+ I2
Correct answer: C. Kp= kc
- A. Kp > kc
- B. Kc > kp
- C. Kp= kc
- D. Kp ≤ kc
Explanation
For gases, Kp = Kc(RT)^Δn, where Δn = total gaseous product moles - total gaseous reactant moles. For 2HI(g) ⇌ H2(g) + I2(g), Δn = (1 + 1) - 2 = 0, so Kp = Kc(RT)^0 = Kc. The likely wrong choice is Kp > Kc, caused by assuming pressure-based constants are always larger.
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About Reversible Reactions
A reversible reaction proceeds in both forward and backward directions, so reactants and products continue changing until dynamic equilibrium is established. The topic covers the meaning of equilibrium, the equality of forward and reverse rates, and how concentration, pressure and temperature disturb equilibrium, which is separate from the rate at which equilibrium is reached.
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