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Why is Na(2)O(2) used for purifying air ...

Why is `Na_(2)O_(2)` used for purifying air in submarines and in crowded places?

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`Na_(2)O_(2)` reacts with `CO_(2)` of air to evolve `O_(2) (2Na_(2)O_(2) + 2CO_(2) rarr 2Na_(2)CO_(3) + O_(2) uarr)`. For this reason, `Na_(2)O_(2)` is used for the purification of air in submarines and in crowded places.
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