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Penjelasan
K2Cr2O7 = (2 * biloks K) + (2 * biloks Cr) + (7 * biloks O)
0 = (2*1) + (2*Cr) + (7*-2)
0 = 2 + 2Cr - 14
0 = -12 + 2Cr
2Cr = 12
Cr = +6
4. K2CrO4 = (2*biloks K) + (Cr) + (4*biloks O)
0 = (2*1) + Cr + (4*-2)
0 = 2 + Cr + -8
Cr = +6
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