Question

The r.m.s. velocity of hydrogen at $27^{\circ }C$, $R=8.314Jmo{l}^{-1}{K}^{-1}$ is

• A. $1.934m/s$
• B. $19.34m/s$
• C. $193.4m/s$
• D. $1934m/s$

Answer 1

Answer: (D)

$U_{rms}=\sqrt{\frac{3RT}{M_W}}$
$\Rightarrow \sqrt{\frac{3\times 8.314\times 300}{2\times 10^{-3}}}$
$U_{rms}=1934m/sec$