Jawabanmu

2014-05-31T16:49:27+07:00
Ar X = massa satu atom unsur X / (1/12) x massa satu atom C-12
Mr X = massa 1 molekul senyawa X / (1/12) x massa satu atom C-12
CONTOH :
Mr H2O = 2 x Ar H + 1 x Ar O = 2 x 1,008 + 1 x 16,00 = 18,016 sma


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