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maaf kalau salah
0,2 = gram/62,5 x 1000/50
0,2 = 20 gram/62,5
12,5 = 20 gram
gram = 125 x 10 pangkat -1/2 x 10 pangkat 1
= 62,5 x 10 pangkat -2
= 625 x 10 pangkat -3 gr
mol = gram/Mr
= 625 x 10 pangkat -3/ 625 x 10 pangkat -1
= 10 pangkat -2
= 0,01 mol