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Bonjour, j’ai besoins d’aide pour cette exercice :
6 Calculer une masse de solide à peser
I Effectuer un calcul.
Une solution aqueuse de permanganate de potassium a
une concentration en masse t = 0,50 g.L-1. On souhaite
en préparer un volume V
solution = 0,200 L.
1. Écrire la relation permettant de calculer la masse m
de permanganate de potassium à peser pour préparer
cette solution. Indiquer les unités de chaque grandeur.
2. Déterminer la valeur m de la masse à peser.

Sagot :

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