Question

The volume of a gas is $1liter$ at the presure $1.2\times {10}^{7}N{m}^{-2}$ and temperature $400K$. Calculate the no. of molecules in the gas.

Answer 1

Given : $P=1.2\times {10}^{7}N{m}^{-2}$ $T=400K$

Volume $V=1L={10}^{-3}{m}^3$

Number of moles $n=\frac{PV}{RT}$

$⟹n=\frac{1.2\times {10}^7\times {10}^{-3}}{8.314\times 400}=3.6$