Exercices - la masse molaire

4TI4TC Sciencesdebase3h/semaine-CHIMIE
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Exercice 1 : Choisir la (les) bonne(s) réponse(s). Donner des explica9ons (s’il y a
lieu)
1. La masse molaire moléculaire correspond à la masse de :
/01)("(213)4(-.+5%6+#'(
78#(-.+#(9#(-.+5%6+#'(
/01)("(21)4(-.+5%6+#'(
2. La masse molaire M de l'acide lactique C3H6O3 est égale à :
:(;(4(:<(=(/(:>(=(4(:?((
:(;(:<(=(4(:>(=(/(:?((
:(;(:<(=(:>(=(:?((
3. La masse molaire atomique s'exprime en :
@(
-.+A@32(
@(A(-.+32(
BA 78#(-.+#(,(*(
78#(-,''#(95C#89,8D(9#(+,(8,D6$#(9#(+E#'CF%#(%G&-&H6#A((
I.6J.6$'(+,(-K-#(-,''#(H6#++#(H6#('.&D(+E#'CF%#(%G&-&H6#(
LA M,(-.+#(#'D(+E68&D5(&8D#$8,N.8,+#(9#(*((
:,''#(
O.+6-#(
:,''#(P.+6-&H6#(
:,''#(-.+5%6+,&$#(
Q6,8ND5(9#(+,(-,NF$#(!
Exercices : la masse molaire - p1

4TI4TC Sciencesdebase3h/semaine-CHIMIE
Exercice 02 :
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4A ME&'.C$F8#(,(C.6$(X.$-6+#(<L>\0(+#(%,.6D%G.6%(8,D6$#+0(C$.96&D(C,$(+EG5P5,0(#'D(
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,] <,+%6+#(+,(-,''#(-.+,&$#(-.+5%6+,&$#(9#(+E&'.C$F8#A(
Y] 78#(-,%$.-.+5%6+#(9#(%,.6D%G.6%(8,D6$#+((a<L>\]V(,(C.6$(-,''#(-.+,&$#((
:-(;()1B(111(@b-.+A(c5D#$-&8#(+#(8.-Y$#(d(y(e(9#(-.+5%6+#'(9E&'.C$F8#(
%.8'ND6,8D(+,(%G,`8#(9#(%#^#(-,%$.-.+5%6+#A((
V(;(!
Exercices : la masse molaire - p2