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VoroHobbit
@VoroHobbit
May 2021
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Решите задачи по химии(8 класс)
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DarinaZ110
2.32.
а)4P+5O₂⇒2P₂O₅;
б)S+O₂⇒SO₂;
в)C+O₂⇒CO₂;
г)4Fe+3O₂⇒2Fe₂O₃.
2.33.
а)4Al+3O₂⇒Al₂O₃;
б)2Ca+O₂⇒2CaO;
в)4Li+O₂⇒2Li₂O;
г)2Cu+O₂⇒2CuO.
2.34.
а)2C₂H₆+7O₂⇒4CO₂+6H₂O;
б)2C₄H₁₀+13O₂⇒8CO₂+10H₂O;
в)2H₂S+3O₂⇒2SO₂+2H₂O;
г)2C₂H₂+5O2⇒4CO₂+2H₂O.
2.38.
а)Cl₂O₃;
б)CaO;
в)Fe₂O₃;
г)Mn₂O₇;
д)Na₂O;
е)N₂O₅.
2.93.
а)M(CO)=12+16=28;
w(O)=16/28=0,57;
б)M(N₂O)=2*23+16=62;
w(O)=16/62=0,26;
в)M(P₄O₆)=31*4+16*6=220;
w(O)=96/220=0,44;
г)M(SiO₂)=28+16*2=60;
w(O)=32/60=0,53.
2.40.
а)M(H₂SO₄)=1*2+32+16*4=98;
w(O)=64/98=0,65;
б)M(H₂O₂)=1*2+16*2=34;
w(O)=32/34=0,94;
в)M(CaCO₃)=40+12+16*3=100;
w(O)=48/100=0,48;
г)M(CuSO₄)=64+32+16*4=160;
w(O)=64/160=0,4.
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Answers & Comments
а)4P+5O₂⇒2P₂O₅;
б)S+O₂⇒SO₂;
в)C+O₂⇒CO₂;
г)4Fe+3O₂⇒2Fe₂O₃.
2.33.
а)4Al+3O₂⇒Al₂O₃;
б)2Ca+O₂⇒2CaO;
в)4Li+O₂⇒2Li₂O;
г)2Cu+O₂⇒2CuO.
2.34.
а)2C₂H₆+7O₂⇒4CO₂+6H₂O;
б)2C₄H₁₀+13O₂⇒8CO₂+10H₂O;
в)2H₂S+3O₂⇒2SO₂+2H₂O;
г)2C₂H₂+5O2⇒4CO₂+2H₂O.
2.38.
а)Cl₂O₃;
б)CaO;
в)Fe₂O₃;
г)Mn₂O₇;
д)Na₂O;
е)N₂O₅.
2.93.
а)M(CO)=12+16=28;
w(O)=16/28=0,57;
б)M(N₂O)=2*23+16=62;
w(O)=16/62=0,26;
в)M(P₄O₆)=31*4+16*6=220;
w(O)=96/220=0,44;
г)M(SiO₂)=28+16*2=60;
w(O)=32/60=0,53.
2.40.
а)M(H₂SO₄)=1*2+32+16*4=98;
w(O)=64/98=0,65;
б)M(H₂O₂)=1*2+16*2=34;
w(O)=32/34=0,94;
в)M(CaCO₃)=40+12+16*3=100;
w(O)=48/100=0,48;
г)M(CuSO₄)=64+32+16*4=160;
w(O)=64/160=0,4.