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Balancing electrons: Oxidation-reduction method

Please help balance the electrons in the following formulas:

Sn+HNO3-------.SnO2+NO2+H2O
Sn---->SnO2
2H20+Sn-------->SnO2+4H+4e

also, how do I balence this one
Na+H2O----->NaOH+H2

Solution Summary

The following solution involves balancing electrons in various reactions using the oxidation-reduction method.

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