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Bonjour, 

je n'arrive pas trop à faire cette item :

A. La masse volumique d’un composé ionique X+Y - de structure cfc vaut =2 g*cm-3 . La masse molaire de ce composé est MXY=37,5 g mol-1 .Est-ce que la somme des rayons r++r- vaut 250 pm ? Pour simplifier les calculs on considère NA=6*1023 mol-1 . (V)

 

Merci d'avance 

 

 

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