Physics - Heat & Thermo Question with Solution | TestHub

Number of molecules in a volume of$4 {\mathrm{cm}}^3$of a perfect monoatomic gas at some temperature T and at a pressure of$2 \mathrm{cm}$of mercury is close to? (Given, mean kinetic energy of a molecule (at T) is$4\times {10}^{-14} \mathrm{erg}, \mathrm{g}=980 \mathrm{cm} {\mathrm{s}}^{-2}$density of mercury$=13.6 \mathrm{g} {\mathrm{cm}}^{-3}$)