November 2019 2 2K Report
O íon sulfito (SO32-) reage com o íon bicromato (Cr2O72-), segundo a equação:
Cr2O72-(aq) + SO32-(aq) + H3O+(aq) → Cr3+(aq) + SO42-(aq) + H2O(ℓ)
Calculando a soma dos valores que balanceiam a equação acima, obtemos:
a)15
b)5
c)12
d)29
e)28
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