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massa O = 100 - 90,7 = 9,3 gram
massa x3O4 = 90,7 + 9,3 = 100 gr
massa x = 3x / Mr X3O4 x massa X3O4
90,7 = 3x / (3x + 4(16)) x 100
272,1x + 5804,8 = 300x
300x - 272,1 x = 5804,8
27,9x = 5804,8
x = 208
Ar X = 208