1. a) 2Ca+O2=2CaO
б) 4Al+3O2=2Al2O3
в) 2Mg+O2=2MgO
г) N2+3H2=2NH3
2. a) 2Na+O2=Na2O2
б) H2+Cl2=2HCl
в) 2K+S=K2S
3. M(EO3)=80
M(E)=M(EO3)-3M(O)
M(E)=80-3×16=32
E - Сера S
4. E2O3
w(O)=47,06%=0,4706
----------------------------------
3M(O)/(M(E2O3))=0.4706
M(E2O3)=3×16/0,4706=102
M(E)=(M(E2O3)-3M(O))/2
M(E)=(102-3×16)/2=27
E - Алюминий Al
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Answers & Comments
1. a) 2Ca+O2=2CaO
б) 4Al+3O2=2Al2O3
в) 2Mg+O2=2MgO
г) N2+3H2=2NH3
2. a) 2Na+O2=Na2O2
б) H2+Cl2=2HCl
в) 2K+S=K2S
3. M(EO3)=80
M(E)=M(EO3)-3M(O)
M(E)=80-3×16=32
E - Сера S
4. E2O3
w(O)=47,06%=0,4706
----------------------------------
3M(O)/(M(E2O3))=0.4706
M(E2O3)=3×16/0,4706=102
M(E)=(M(E2O3)-3M(O))/2
M(E)=(102-3×16)/2=27
E - Алюминий Al