Question

решите пожалуйста !! 1) HBr+MnO2⇒MnBr2+Br2+H2O
2)Fe+HNO3⇒Fe(NO3)2+N2+H2O
3)KBr+MnO2⇒KBr+O2

Answer 1

4HBr+MnO2⇒MnBr2+Br2+2H2O
2Br(-1)-2е=Br(0)2
Fe+4HNO3(р)=Fe(NO)3+NO+2H2O
Fe(0)-3e=Fe(+3)
N(+5)+3e=N(+2)