Jawabanmu

2014-06-08T14:02:25+07:00
Ar Na = massa rata-rata atom Na/[1/12] x massa 1 atom C-12
Ar Na = 23 / [1/12] x 2 x 10^-27
Ar Na = 23 / [1/6] x 10^-27
Ar Na = 138 x 10^27
Ar Na = 1,38 x 10^-25 sma
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