Answer :

STP means standard temperature-273.15K and pressure


101.325 kPa.


Volume of ideal gas at STP= 22.4L


Number of molecule in 22.4L of ideal gas at STP=Avogadro number =6.022


Now we know that


1Litre=103cm3


22.4L=22.4103cm3


Number of molecule in 22.4103cm3 of ideal gas at STP=6.022


Therefore,


Number of molecules in 1cm3 of ideal gas at STP==.


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