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What is the active mass of one litre of ...

What is the active mass of one litre of oxygen gas at NTP?

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Generally for gases partial pressure is taken as active mass . Since pure oxygen is present at STP, active mass of oxygen= 1 atm
At STP 22.4 litres of oxygen =1 mole
Active mass =`n/V=1/22.4=0.0446 mol L^-1`
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