Уравнять с помощью электронного баланса
1)Al+HCl-->AlCl3+H2
2)HY+H2SO4-->Y2+H2S+h20
3)H2s+HNO3-->S+NO2+H20
2Al+6HCl-->2AlCl3+3H2
Al(0)-3e=Al(+3) |2
2H(+)+2e=H2(0)| 3
8HI+H2SO4=4I2+H2S+4H2O
2I(-)-2e=I2(0) |4
S(+6)+8e=S(-2)| 1
H2S+2HNO3=S+2NO2+2H2O
S(-2)-2e=S(0) |1
N(+5)+1e=N(+4)| 2
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Answers & Comments
2Al+6HCl-->2AlCl3+3H2
Al(0)-3e=Al(+3) |2
2H(+)+2e=H2(0)| 3
8HI+H2SO4=4I2+H2S+4H2O
2I(-)-2e=I2(0) |4
S(+6)+8e=S(-2)| 1
H2S+2HNO3=S+2NO2+2H2O
S(-2)-2e=S(0) |1
N(+5)+1e=N(+4)| 2