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Salut, j’aurais besoin de la formule pour calculer le nombre d’oxydation d’un atome. Merci

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Posted

Salut,

 

Je vais t'expliquer comment on fait:

 

Etape 1: Regarder la "charge" globale de la molécule.

   Par exemple:

n.o(CO2)=0

n.o(MnO4-)= -1

 

Etape 2: Retenir ces valeurs:

nogh.png

 

Etape 3: En déduire le nombre d'oxydation de l'atome mentionné dans l'item:

   Par exemple:

- pour le CO2

n.o(C) + 2n.o(O)=0

n.o(C) + 2* (-2)= 0

n.o(C) - 4= 0

n.o(C)=4

 

-pour le n.o(MnO4-):

n.o(Mn) + 4n.o(O)= -1

n.o(Mn)+ 4* (-2) = -1

n.o(Mn) - 8 = -1

n.o(Mn)= -1+8

n.o(Mn)= 7

 

Bon Courage!!!

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