k units [ENDORSED]

[Phi Phi Do 2E]

Why is the constant K in different units depending on the rate order?

[Jessica Patzlaff 1A]

There is a different equation for each rate order, and thus a different k unit to cancel out to get the final units.

[Sophie Krylova 2J]

From the general formula R=k[X]^n you can see that the rate units are fixed and so are the concentration units. Therefore, k units will change depending on what power the concentration is raised to.

[Jaewoo Jo 2L]

You need to find the K with the right units so that it cancels with the rate order equation.

[604807557]

It’s different units depending on the rate order because each order has different powers the concentration is raised to so using the rate law you get different units for k in each rate order.

[Wenjie Dong 2E]

It's because the unit of the reaction rate is always the same.

[Jessica_Singh_1J]

As a reminder:

the units for k in a 0 order reaction are: mol/L*s , for a 1st order reaction are: 1/s, for a 2nd order reaction are: L/mol*s.

[Ryan Sydney Beyer 2B]

The units for k depend on what order the reaction is on. This is because the concentrations - which will be to the zero, first, or second order for this. So mol / L will be raised to some exponent. We know that the rate of the reaction is going to have units of mol / L * s, so we just have to make sure that the units of k made the right side of the equation having these units.