10^21 molecules of oxygen
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Hiiii....
no. of moles=No. of molecules / N.... (N is avagadro number....)...
No. of moles=10^21/ 6×10^23...
= 1/6 ×10^-2 = 0.0016 ...
Volume at STP=moles × 22.4
=0.0016 × 22.4 =0.037
L ...
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