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Physics, 17.02.2021 21:20 nika0001

Besoin d'aide stp. Exercice
Le citronellol, de formule C10H200, est la molécule responsable de l'arôme de rose. Il faut environ 4 tonnes de pétales pour obtenir 1 kg d'huile essentielle de rose contenant 45% en masse de citronellol. Le seuil de détection olfactif est tel que notre nez peut en détecter une masse aussi faible que 500 femtogrammes (5,00.10 puissance -13 g).
1) Exprimer puis calculer la masse m0 d'une molécule de citronellol.
2) Exprimer puis calculer la quantité n de citronellol dans m = 1 kg
d'huile essentielle de rose.
3) Exprimer puis calculer le nombre N de molécules de citronellol
correspondant au seuil de détection olfactif.
Données : Masses des atomes
m(C) = 1,99.10 puissace -26 kg; m(H) = 1,67.10 puissance-27 kg : m(O) = 2,66.10 puissance-26 kg​

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Besoin d'aide stp. Exercice
Le citronellol, de formule C10H200, est la molécule responsable d...
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