Does oxidation cause an increase or decrease in mass?

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Answer 1 · 2017-06-23T07:46:41

Well formally yes........

Because oxidation represents the formal LOSS of electrons.....

$N a (s) \to N a^{+} + e^{-}$ $Na(s) rarr Na^(+) +e^(-)$

And since electrons have definite (admittedly negligible) mass, this is a formal mass loss.

Of course for every oxidation there is a corresponding reduction , so certainly mass is conserved in the overall redox equation.

$H_{2} O + e^{-} \to \frac{1}{2} H_{2} (g) + H O^{-}$ $H_2O +e^(-) rarr 1/2H_2(g) + HO^-$

and the overall reaction is........

$N a (s) + H_{2} O (l) \to N a O H (a q) + \frac{1}{2} H_{2} (g)$ $Na(s)+ H_2O(l) rarr NaOH(aq) + 1/2H_2(g)$