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( 1 x 2 ) + Cr + ( -2 x 7 ) = 0
2 + Cr - 14 = 0
Cr = 14 - 2
Cr = 12
adanya
2. Biloks H + 2.biloks Cr + 7. Biloks O = 0
2 + 2.biloks Cr + -14 = 0
2.biloks Cr = 12
Biloks Cr = +6