1.

Estimate the total number of molecules inclusive of oxygen, nitrogen, water vapour and other constituents in a room of capacity 25.0m^(3) at a temperature of 27^(@)C and 1 atmospheric pressure.

Answer»

Solution :As Boltzmann's constant
`k_(B)=(R )/(N)`, `:. R=k_(B)N`
Now `PV=nRT=nk_(B)NT`
`:.` The number of molecules in the ROOM
`=nN=(PV)/(Tk_(B))`
`=(1.013xx10^(5)xx25.0)/(300xx1.38xx10^(-23))`
`=6.117xx10^(26)`


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