нужно расставить коэфициенты методом электронного баланса

 

 

1)K2Cr2O7+NaI+H2SO4---->Cr2(SO4)3+I2+Na2SO4+K2SO4+H2O

2) KMnO4+(NH4)Br+H2SO4--->MnSO4+Br2+K2SO4+(NH4)2SO4+H2O

 

 

 

 

 

 

 

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