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Cati atomi de cupru exista in cele 2 grame de cupru ??

Răspuns :

1mol..............64g
x moli..............2g
x=2*1/64=0.03125 moli

1mol..........................6.023*10²³
0.03125 mol...............y
y=0.03125*6.023*10²³/1=188.21*10²⁰ atomi