Answer :

STP means standard temperature-273.15K and pressure


101.325 kPa.


Given


Volume of oxygen gas=1 cm3


We know that


Volume of oxygen gas at STP= 22.4L


1Litre=103cm3


22.4L=22.4103cm3


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


Therefore,


1cm3 of O2 = mol of O2


I mol of O2 =32 grams of O2


mol of O2 = grams of O2=1.43grams


1g=mg


The mass of 1 cm3 of oxygen kept at STP=1.43mg.


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