Question

The average kinetic energy of the molecules of a low density gas at $27^{\circ}C$ is
(Boltzmann constant $= 1.38 × 10^{-23}\, J\, K^{-1}$)

• A. $3.1 × 10^{-20}\, J$
• B. $3.5 × 10^{-21}\, J$
• C. $5.3 × 10^{-18}\, J$
• D. $6.21 × 10^{-21}\, J$

Answer 1

Answer: (D)

Kinetic energy $= \frac{3}{2} kT = \frac{3}{2} \times\left(1.38\times10^{-23}\right)\left(300\right)$
$ = 6.21 × 10^{-21}\, J$