L'acier est un alliage (Fe+c).On trouve 6.43g d'acier par l'acide sulfurique concentrée pour transformer completement le fer en fe++ dans une solution de V=50ml (notée S) On prélève 10 ml de la solution (S) sur lequel on ajoute une solution de kMno4 0.03mlol. l-¹ en milieu acide , la décoloration cesse pour un volume versée dekMnO4=10 ml ; M(Fe)=56 g. mol-¹
1) Calculer [FE++] dans (S)

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answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.

c

explanation: