Number of molecules in a volume of of a perfect monoatomic gas at temperature and…

PHYSICS · Single correct · A Level · Physics · Further mechanics and thermal physics · Further mechanics and thermal physics

Problem

Number of molecules in a volume of

4 \text{ cm}^3

of a perfect monoatomic gas at temperature

T

and pressure of

2 \text{ cm}

of mercury is close to? (Given mean kinetic energy of a molecule at

T

4 \times 10^{-14} \text{ erg}

g = 980 \text{ cm/s}^2

, density of mercury =

13.6 \text{ g/cm}^3

) (1)

4.0 \times 10^{18}

(2)

4.0 \times 10^{16}

(3)

5.8 \times 10^{16}

(4)

5.8 \times 10^{18}