Question

At room temperature a diatomic gas is found to have an r.m.s. speed of $1930m{s}^{-1}$. The gas is :

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

Answer 1

Answer: (A)

$\because C=\sqrt{\frac{3RT}{M}}$
${\left(1930\right)}^2=\frac{3\times 8.314\times 300}{M}$
$M=\frac{3\times 8.314\times 300}{1930\times 1930}\approx 2\times 10^{-3}kg$
The gas is $H_2.$