modelisation_macroscopique.py

Created by maelametzger2016

Created on December 11, 2021

727 Bytes


vapp(A)t=d[A]/dt

vdisp(A)t=-d[A]/dt

Reaction d'ordre 1 par rapport au reactif limitant si :

Pour equation aA+bB->cC+dD 

-tps de demi reaction t1/2 indépendant de [ ] initiale [A]0

-vitesse volumique proportionnelle a [A]t
    vdisp(A)t= k1×[A]t et vapp(C)t= k2×[A]t

(Une equation differentielle d’ordre 1, admet pr soluti du type:(avc [ ]0 et k des constantes)

-Loi exponentielle [A]t= [A]0×exp (-k×t)

logarithme:

ln(a*b)= lna+lnb    
ln(a/b) 
e**lna=a
ln(e**a)=a

donc avc Loi exponentielle :ln ( [A]t) = ln ([A]0) × ln (exp (-k×t))
on a: k=ln ([ ]0/[ ]t)/t
mais aussi : t(1/2)=(ln(2) /k)  

(ou chercher k=coeff ds calculatrice en mettant ln[ ]=f(t) mettre x=t y=ln[ ]












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