3N2+3H2----2NH3. 2Al+3Fe2----2AlFe3. 2P+5Br2---2PBr. S+O2----SO2-тут и так все равно
A) 2AgNO3 +K2S = 2KNO3 + Ag2S
2Ag+ + 2NO3- + 2K+ + S2- = Ag2S + 2K+ + 2NO3-
2Ag+ + S2- = Ag2S
CH₃ C₂H₅
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H₃C - CH₂ - C - CH - CH₂ - CH₂ - CH₃
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CH₃
CH₃ C₂H₅ CH₃
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H₃C - CH - C - CH₂ - CH₂ - CH₂ - CH₂ - CH₂ - CH₃
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CH₃
Сa(OH)2 + 2HNO3 -> Ca(NO3)2 + 2H2O
Fe2O3 + 3Mg -> 3MgO + 2Fe
2Fe(OH)3 -> Fe2O3 + 3H2O
2CO + O2 -> 2CO2
2Na + Cl2 -> 2NaCl
CH4 -> C + 2H2
3K2O + P2O5 -> 2K3PO4
2Al +3 CuCl2 -> 2AlCl3 + 3Cu
Ba +2 H2O -> Ba(OH)2 + H2
M (MgSO4)= 24+32+64=120
W (Mg) = 24/120*100=20%
W (S)= 32/120*100=26,7%
W (O)= 4*16/120*100=53,3%