Unit of rate of reaction is_________________?
Correct answer: A. Moles dm-3 sec-1
- A. Moles dm-3 sec-1
- B. Moles dm-3
- C. Moles sec-1
- D. Mol-1 dm3 sec-1
Explanation
Reaction rate is the change in concentration per unit time, so its usual unit is moles dm-3 sec-1. Moles dm-3 alone is a concentration unit, while mol-1 dm3 sec-1 is commonly a unit of a second-order rate constant. Students may choose c by using moles per second, but that describes the rate of amount change rather than the usual concentration-based reaction rate.
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About Rate of Reaction
Reaction rate measures the change in concentration of a reactant or product per unit time. Questions connect rate with concentration, temperature, pressure, surface area, catalysts and nature of reactants, and may involve rate laws, reaction order, activation energy and collision theory. Rate describes speed, whereas equilibrium describes the final balance of opposing reactions.
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