Расставить коэффициенты методом электронного  баланса:

 


1.     
Na
+  H2SO4  =   Na 2SO4
+  S + 
H2O


 

 


2.     
Fe  +  H2SO4   =   Fe2(SO4)3  +  SO2   +  H2O


 

 


3.     
Al  +  H2SO4   =   Al2(SO4)3  +  H2S   +  H2O
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