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  • In room condition the volume is 24dm3

So convert 500cm3 to dm3

1 dm3 equals 1000cm3

x dm3 equals 500cm3

500÷1000=0.5dm3

6.02×10^23 molecules of O2 equals 24 dm3

xmolecules equals 0.5dm3

0.5×6.02 ×10^23 ÷24= 1.25 ×10^22

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