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I.2. NOTION DE MOLE
  1. Rappel
  • Effectuez l’opération suivante :8,04. 102,04. 10-23
  1. Motivation
  • Calculez la masse molaire de nacl.
  • Que signifie g/Mol
  1. Annonce du sujet

Chers élèves, à cette heure nous allons étudier :

- qu'entendez-vous par la mole?

- que désigne le masse molaire et quelles sont les expressions mathématiques de la masse molaire?

- que désigne la quantité de matière et quelles en sont les expressions mathématiques?

 Qu'avons - nous étudié aujourd'hui?

- Qu'entendez-vous par la mole?

8,04. 102,04. 10-23=3, 94.1014 

La masse molaire de Nacl est égale à : 23+ 35,5 = 58, g/Mol

  • Le g/mol signifie gramme par mole
  1. Annonce du sujet
  • La notion  de mole

I.2. Notion de Mole

La mole est la quantité de matière renfermant 6,02.1023 Particules (atomes, molécules, ions aux électrons).

NA=6,02.1023 particules par mole  

NA :nombre d'avogadro  

I.2.1. Masse molaire (Mm)

C’est la masse d’une mole d’une substance exprimée en gramme par mole (g/mol).

Mm=Arg/mol

Mm=Ar

Mm=Mrg/mol

Ou                                                       ou

Mm = masse molaire en g/mol

Arg/mol : Masse atomique en gramme par mole

Mrg/mol: Masse moléculaire en gramme  par mole

Ar Somme des masses atomiques d’une molécule en u.m.a

U.m.a : unité de masse atomique 1 uma =1,66.10-24g

Ex : calculer la masse molaire d’une molécule d’eau.

H20: Mm=1x2+16=18g/mol 

I.2.2. Quantité de matière (n)

C’est le nombre des moles correspondant à une masse donnée ou à un nombre donné des particules d’une substance.

N=mMm

N=mMm

ou

n : Quantité de matière en mol

m : Masse de la substance en gramme (g)

N : Nombre des particules (nombre d’atomes, molécules, ions ou électrons).

NA:nombre d'avogadro 6,02.1023 

Ex :1) combien de moles y a-t-il dans 1,40g diazote (N2).

Résolution : Données       inconnue      formule

                m=1,40g            n= ?            n= mMm  

                 N: Mm = 14x2 = 28g /mol

Calcul

N= 1,4028=0,05 mol

2) Combien des moles y a-t-il dans 1,5.1021 molécules de N20 ?

Nous avons étudié la mole, la masse molaire et la quantité  de matière.

- La mole est la quantité de matière que renferme NA particules.

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