Ответы на вопрос:
1) so2 w(s) = 50% w(o2)= 49,95% 2)zno w(zn) = 80% w(o)= 19,65 =20% 3) mgs w(mg)= 43% w(s)= 56,8 = 57% 4) fes2 w(fe)= 46% w(s2) = 54% 5) cacl2 w( ca) = 36 w(cl2) = 64 % 6)feo w(fe)= 77% s(o)=22%
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