1.

One litre of a gas is at a pressure of 10^(-6) mm of Hg at 25^(@)C. How many molecules are present in the vessel?

Answer»

`3.2xx10^(6)`
`3.2xx10^(13)`
`3.2xx10^(10)`
`3xx10^(4)`

SOLUTION :`(P_(1)V_(1))/(T_(1))=(P_(2)V_(2))/(T_(2)) THEREFORE (10^(-1)xx1000)/(298)=(760xxV_(2))/(273)`
or `V_(2)=1.2xx10^(-6)"cc (at STP)"`
No. of MOLECULES `=(6.02xx10^(23))/(22400)xx1.2xx10^(-6)`
`=3.2xx10^(13)`


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