Question

The volume of a gas at $0^{o}C$ and 760 mm pressure is 22.4 cc. Find the no. of molecules present in this volume.

Answer 1

From ideal gas equation

$PV=nRT$

$n=PV/RT$

$=\frac{760}{22.4}$ $\times 22.4\times$ ${10}^{-3}L/(0.0821L$ $atm/molK$ $\times 273)$

$=0.03$ $mol\times 6.022\times {10}^{23}$ molecules

$=2.041\times {10}^{22}$ molecules

$2.041\times {10}^{22}$ molecules are present in the volume