Unit of Kc is_______________?
Correct answer: D. Kc may or may not have units
- A. moles2dm+6
- B. moles-2dm+6
- C. moles+2dm-6
- D. Kc may or may not have units
Explanation
For a reaction such as N2 + 3H2 ⇌ 2NH3, delta n = 2 - 4 = -2, so Kc has units of (mol dm-3)^-2 = dm6 mol-2. However, Kc does not have one universal unit: the units depend on the balanced equation and may cancel completely for some reactions. Students may choose option b by assuming the question refers only to ammonia synthesis, but no reaction is stated, so option d is the generally valid answer.
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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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