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m = 4,8 gram
Ar = ........?
Penyelesaian :
* Mencari mol
mol = JP/Avogadro
mol = 12,04 x 10²²/6,02 x 10²³
mol = 0,2 mol
* Mencari Ar
Ar = massa/mol
Ar = 4,8/0,2
Ar = 24
Jadi, massa atom relatif nsur A adalah 24