Ответы на вопрос:
Mr(al2o3) = 27*2 + 16*3 = 102 w(al) = ar(al) * n / mr(al2o3) *100% = 27*2 / 102 *100% = 53% w(o) = ar(o) * n / mr(al2o3) *100% = 16*3 / 102 *100% = 47%
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