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QCM chimie du solide


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Posted

considérons un élément X qui cristallise selon une maille cubique simple. : 

masse molaire = 90 g/mol

masse volumique p = 1,2 g/cm3

Na= 6x10^23

 

dans le ccm on nous dit : l'élément X possède un rayon atomique R=0,25m .

mais je n'arrive pas a savoir comment on y arrive ? je connais la formule mais je n'y arrive pas quand meme

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Posted

 Hey j'ai repondu a cette question bon courage et n'hesite pas si c'est pas claire 

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