Units of rate

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Units of rate: 

We have the rate of reaction=

Change in concentration of the reaction or product
_____________________________
              Time taken
  Thus,  reaction rate has the units of concentration divided by time. Concentration in moles per litre (molar concentration, M =mol dm-³), and time may be in seconds, (s), minutes (min), hours (h), days (d) or possibly years (y). 
Therefore, the units of reaction rates may be
      
mol dm-³ s-¹ or mols/ liter, sec or Ms-¹ 

mol dm-³ min-³ or moles/liter min, or M min-¹

 mol dm-³h-¹ or moles/ liter- hour or Mh-¹ and so on 

In gaseous reaction, pressure is normally used and thus rate is expressed in atm sec-¹ or atm mim-¹.


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