The reaction that would occur when a hot tungsten filament bulb was surrounded by air is 2 W(s) + 3 O2(g) -> 2 WO3(s).
Tungsten is the filament found in an electric bulb. It is the material that enables the bulb to produce light when heated electrically.
However, when the hot tungsten filament is exposed to air, the oxygen in air could react with the tungsten filament as follows; 2 W(s) + 3 O2(g) -> 2 WO3(s). This may result in a fire accident as tungsten filament is burnt out.
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