Question

The mean kinetic energy of gas molecules is zero at

• A. 0${}^o$C
• B. -273${}^o$C
• C. 100 K
• D. 100${}^o$C

Answer 1

The correct option is B -273${}^o$C

$K{E}_{avg}=\frac{3}{2}kT$ where T is in Kelvin.
$K{E}_{avg}=0$ at $T=0^{\circ }K=-{273}^{\circ }C$