Problem: A reaction A + B obeys the following rate law: Rate = k [B]2.What are the units of the rate constant?

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We’re being asked to determine the units of the rate constant of a reaction A + B that obeys the following rate law: Rate = k [B]2


Recall that the rate law only focuses on the reactant concentrations and has a general form of:

rate law=kAxBy

k = rate constant
A & B = reactants
x & y = reactant orders


Reaction:      A + B

Given:          Rate = k [B]2


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Problem Details

A reaction A + B obeys the following rate law: Rate = k [B]2.

What are the units of the rate constant?

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Rate Law concept. You can view video lessons to learn Rate Law. Or if you need more Rate Law practice, you can also practice Rate Law practice problems.

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Based on our data, we think this problem is relevant for Professor Dixon's class at UCF.