Kc value has_______________?
Correct answer: C. Both A & B
- A. No units
- B. Units
- C. Both A & B
- D. None
Explanation
The units of Kc depend on the change in the total number of moles of gaseous or dissolved species in the balanced equation. For some reactions the concentration units cancel, giving no units, while for others concentration units remain. The likely trap is option a, because Kc is not universally unitless in the convention used in these calculations.
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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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