Question

ПОМОГИТЕ! электронный баланс уравнений или одного,или двух,как сможите 1)С7H8+KMnO4= 2)C3H6+H2O+KMnO4= 3)C3H6O+Cu(OH)2=

Answer 1

1)5C6H5-CH3+6KMnO4+9H2SO4=5C6H5-COOH +3K2SO4+6MnSO4+14H2O

                         C(-3) -6e =C(+3)     -5

                      Mn(+7) +5e =Mn(+2) -6

5C(-3) +6Mn(+7) = 5C(+3) + 6Mn(+2)

2)C3H6+2KMnO4+2KOH=CH3-CH(OH)-CH2(OH) +2K2MnO4

                     

                       C(-2) -1e=C(-1)      -2

                    Mn(+7) +1e =Mn(+6) -1

                            C +1e= C(-1)

2C(-2) +Mn(+7) +C=2C(-1) +Mn(+6) +C(-1)

3)CH3-CH2-COH +2Cu(OH)2= CH3-CH2-COOH +Cu2O+2H2O

                     C(+1) -2e=C(+3)              -1

                      2Cu(+2) +2e= 2Cu(+1)  -1

               C(+1) +2CU(+2) =C(+3) +2Cu(+1)