Jawabanmu

2014-03-30T12:40:28+07:00
C₂O₄²⁻ :

O = -2 x 4 = -8

C₂O₄²⁻  = C₂    +    O₄
      -2   =  C₂   + (-8)
C₂ = 8 - 2
    = 6
2 1 2
2014-03-30T12:41:56+07:00
C2 + O4 = 2-
C2 + 4(-2) = -2
C2 + (-8) = -2
C2 = -2 + 8
C2 = 6
C = 6/2
C = 3
5 4 5