Question

At room temperature, the rms speed of the molecules of a certain diatomic gas is found to be $1930m/s$. The gas is

• A. $H_2$
• B. $F_2$
• C. $O_2$
• D. $C{l}_2$

Answer 1

The correct option is A $H_2$

$v_{rms}=\sqrt{\frac{3RT}{M}}$
Room temperature, $T\approx 300K$
$1930=\sqrt{\frac{3\times 8.31\times {10}^3\times 300}{M}}$
$M=2g$
or the gas is $H_2$.