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May 2019
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Bonjour,je suis au lycée en 2de et je dois faire le correction de mes exercices de physique mais je sèche sur le dernier, si vous pouviez m'expliquer comment faire :) ( Exercice sur la photo ci-jointe ).
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scoladan
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Bonjour,
Masse molaire moléculaire du dichlorométhane :
M = M(C) + 2xM(H) + 2xM(Cl) = 12 + 2x1 + 2x35,5 = 85 g.mol⁻¹
Pour prélever 0,25 mol, il faut donc prélever une masse de :
m = n x M = 0,25 x 85 = 21,25 g
Soit un volume de :
V = m/μ = 21,25/2,40 = 8,85 mL
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Verified answer
Bonjour,Masse molaire moléculaire du dichlorométhane :
M = M(C) + 2xM(H) + 2xM(Cl) = 12 + 2x1 + 2x35,5 = 85 g.mol⁻¹
Pour prélever 0,25 mol, il faut donc prélever une masse de :
m = n x M = 0,25 x 85 = 21,25 g
Soit un volume de :
V = m/μ = 21,25/2,40 = 8,85 mL