Ответы на вопрос:
fe2(so4)3
w(fe) = ar(fe) * n(fe) \ mr (fe2(so4)3 * 100%
w(fe) = 56 * 2 \ 320 * 100
w(fe) =38%
Fe2(so4)3 w=n*ar*100%/mr ar(fe)=56 mr(fe2(so4)3=400 m=400г/моль w(fe)=2*56*100%/400=28%
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