STP means standard temperature-273.15K and pressure
Volume of oxygen gas=1 cm3
We know that
Volume of oxygen gas at STP= 22.4L
Therefore, volume of oxygen gas =22.4103cm3
We know that 22.4L of O2 contains 1 mol O2 at STP.
22.4103cm3 of O2 =1 mol O2
1cm3 of O2 = mol of O2
I mol of O2 =32 grams of O2
mol of O2 = grams of O2=1.43grams
The mass of 1 cm3 of oxygen kept at STP=1.43mg.
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