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K = +1 Cr = x O = -2
+1 +X -2
K2 Cr2 O7 SE MULTIPLICA
+2 +2X -14
2X = 14 -2
2X= 12
X =12/2 = 6 CL CROMO TREABAJA CON +6
ENTONCES: K = +1 CR = +6 O = -2