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  4. The number of electrons lost or gained during the change 3Fe+4H2O arrow Fe3O4 + 4H2 is

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Q. The number of electrons lost or gained during the change $3Fe+4H_2O \rightarrow Fe_3O_4 + 4H_2$ is

Redox Reactions

Solution:

$Fe_3O_4=FeO+Fe_2O_3$
Therefore, the change can be represented as
$Fe--->Fe^{2+}+2e^-$
$2Fe---->2fe^{3+}+6e^-$
Number of electrons transferred = 8.