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4x + 3O2 ----> 2X2O3
7gr 12 gr 19gr
0,5 mol
nyari n O2 = 12/32= 3/8 mol
perbandingan mol= perb. koef.
4/3 x 3/8 = 0,5 mol
Ar x = 7/ 0,5 = 14