Question

The ratio between vapour densities of two gases at the same temperature is 8 : 9. Compare the r.m.s. velocities of their molecules.

Answer 1

\(\frac{c_1}{c_2}=\sqrt\frac{m_2}{m_1}=\sqrt\frac{ρ_2}{ρ_1}\)

=\(\sqrt\frac{9}{8}\)

= c₁: c₂

= \(3:2\sqrt2\)