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Cati neutroni vom gasi in 2.4g Magneziu.
Z=12
masa aromica a Mg=24

Răspuns :

Puia68
A=24= p + n
24= 12+n----> n=12
1atom.........12 neutroni
1mol at.........12x 6,023x10²³ neutroni
2,4/24molat......0,1x12x6,023x10²neutroni ;  (n,mol= m/.M=> 2,4g/24g/mol Mg)
                     =7,22x10²³neutroni

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