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Assuming ideal gas behaviour, how many a...

Assuming ideal gas behaviour, how many atoms of Ar are contained In a typical hunin breath of 0.5L at 1.0 bar and `27^(@)C`? Air consists of 1% Ar atoms. Assuming that the argon atoms from last breath ot Plato have been distributed randomly throughout the atmosphere `( 5xx 10^(18)m^(3))`. How long would it take to breadth one of the atoms? A typical adult breath rate is `10" min"^(-1)`.

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`O_(2)=68.2%`
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