Why we divide the stoichiometric coefficients while expressing the rate of reaction ?

Dear Student,
we divide the stoichiometric coefficients to get the rate of reaction because the stoichiomteric coefficients show the number of moles of a substance , and to get the correct rate of reaction we divide the rate of reaction.
For example 2A+BC
in this we write 
rate of disapperarence of A=- 12At
this is because in the above reaction A is consumed faster so the actual rate of reaction (rate of formation of C) will be half of the rate at which A is consumed 
I hope it is clear to you!'
Regards!

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We divide the coefficients while expressingthe rate in order to maintain the Mol/litre unit
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