Cân bằng 1 số phản ứng hóa học khó

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kisynhi611

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hochanh_mai

CnH2n +KMnO4 + H2SO4 + H2O -> K2SO4 + MnSO4 + C2H2n(OH)2

CH3-C=-CH + KMnO4 + KOH -> CH3COOK + MnO2+ K2CO3 + H2O

(=- là liên kết 3 í ^^)

3CH3-C=-CH + 8KMnO4 + KOH -> 3CH3COOK + 8MnO2+ 3K2CO3 + 2H2O

3 . | 3C(- 4/3) - 8e -> C(+4) +2C(0)
8. | Mn(+7) +3e -> Mn(+4)

10CnH2n+(6n-2n2)KMnO4+(9n-3n2)H2SO4+(8n2-14n)H2O->(3n-n2)K2SO4+(6n-2n2) MnSO4+5C2H2n(OH)2

(5n-2n2 ). | Mn(+7) + 5e -> Mn(+2)
5. | 2nC(-2) -(6n-2n2)e -> 2nC(1--n)

(n2) là n bình phương
 
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