Ответы на вопрос:
1) w(ca) = ar(ca) * n / m (ca(oh)2) *100% = 40 *1 / 74 *100% = 54%
w(o) = ar(o) *n / м(са(он)2 *100% = 16 *2 / 74 * 100% = 43%
w(h) = ar(h) * n / м(са(он)2) *100% = 1 *2 / 74 * 100 % = 2,7%
2) w(fe) = ar(fe) * n / м(fe2(so4)3) * 100% = 56 * 2 / 300 * 100% = 37%
w(s) = ar(s) * n / м(fe2(so4)3 * 100% = 32 * 3 / 300 *100% = 32%
w(o) = ar(o) * n / м(fe2(so4)3 * 100% = 16 * 12 / 300 * 100% = 64%
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