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### units of rates and rate constants

Posted: Mon Mar 04, 2019 3:19 pm
what are the basic units for rates and rate constants? are they different for different orders?

### Re: units of rates and rate constants

Posted: Mon Mar 04, 2019 3:23 pm
Rate of a reaction is generally monitoring the change in concentration over time, thus M/s. For different order reaction, yes rate constants will vary in units, but rate will not.

### Re: units of rates and rate constants

Posted: Mon Mar 04, 2019 4:20 pm
For 0 order reactions, the units for k are M/s, for 1st order reactions, the units for k are 1/s, and for 2nd order reactions the units for k are 1/M*s. With M being molarity or concentration

### Re: units of rates and rate constants

Posted: Mon Mar 04, 2019 4:40 pm
for 0 order reaction, k = mol/Ls. For 1st order, k = 1/s. For 2nd order, k = L/(mol s). Overall the units for a reaction should be mol/Ls

### Re: units of rates and rate constants

Posted: Tue Mar 05, 2019 10:03 am
The above responses are correct. You can think of dividing the units by moles as you move up to the next order.