Ответы на вопрос:
al2o3
w(al) = ar(al) *n / mr(al2o3) * 100% = 27 * 2 / 102 *100% =52,94 %
w(o) = ar(o) * n / mr(al2o3) *100% = 16 *3 / 102 *100% = 47,05%
mr(al2o3) = 27*2 + 16*3 = 102
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