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Exemplo 2 - Detern. e o Nox do crômio nos compostos:
a) Cr2_22O3_33
b) Na2_22Cr2_22O7_77
c) Ca2_22CrO4_44
d) Cr3+^{3+}3+
Al2_22 (S4_44)3_33
Al2_22 S3_33O12_{12}12
2.(+3)+3.x+12.(-2)=0 +6+3x-24 = 0
Nox 3.x = X=+
[X=+
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