A sealed flask contains neon gas ( ) at 295 K

CHEMISTRY · Multi-part · AP · Chemistry · Properties of Substances and Mixtures · Properties of Substances and Mixtures

Problem

A sealed flask contains neon gas (

\mathrm{Ne}

) at 295 K. The molar mass of neon is 20.18 g mol

^{-1}

and its atomic mass is

3.35\times10^{-26}\,\text{kg}

per atom. Avogadro’s number

N_{A}=6.022\times10^{23}\,\text{mol}^{-1}

and Boltzmann constant

k_{B}=1.38\times10^{-23}\,\text{J K}^{-1}

. (a) Calculate the average kinetic energy, in joules, of a single neon atom at 295 K. (b) Determine the average kinetic energy, in kJ mol

^{-1}

, of neon at the same temperature.