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masse molaire atome


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Salut :) j'ai fait un qcm où on me demande si 9843Tc a bien une masse molaire égale à 98g.mol-1. Je ne vois pas trop quel calculs il faut faire (et aussi est-ce qu'il faut que je connaisse certaines valeurs ?), est-ce que quelqu'un peut m'aider ? Merci beaucoup :D

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