Question

What is the average speed of a molecule, having a molecular mass of $529.5gmo{l}^{-1}$. At temperature $100K$

• A. 1
• B. 2
• C. 3
• D. 4

Answer 1

Answer: (B)

$u_{av}=\sqrt{\frac{8RT}{\pi M}},T=100K;M=529.5gmo{l}^{-1}$
$=\sqrt{\frac{8\times 8.314\times 100}{3.14\times 529.5}}=2$
$\therefore$ Average speed of molecule is 2 or (b)