Please help,
What are the units of k in the following rate law?
Rate = k[X][Y]^2

please explain how you get the answer and the steps.

Question

Please help,
What are the units of k in the following rate law?
 Rate = k[X][Y]^2 

 please explain how you get the answer and the steps.

australopithecus · Answer

k has to have units that allow Rate to have units of M/s

In your equation you have M^3 if you multiply out all concentrations what units of k would you need to allow Rate to have units of M/s?

anonymous · Answer

i know the answer is 1/M^2S   i just have no idea how to get the answer.

australopithecus · Answer

are you sure that is the answer? Remember units need to cancel to give you m/s, units cancel out just like numbers when divided

anonymous · Answer

well according the worksheet yes, it gives u the answers with it

australopithecus · Answer

yeah wait that is the answer,

This is a third order equation,

Since you need units of M/s for rate,

Just multiplying/dividing out the units

$$M^3*1/sM^2  = M/s$$

australopithecus · Answer

Third order reactions are rare as hell the chance of three particles colliding into each other at the same time is crazy small

anonymous · Answer

okay im sorry, what exactly is M here dude? i suck at chemistry lmao, ur gonna have to explain it like im a 10 year old lol

australopithecus · Answer

Molarity, these brackets mean molarity [ ]