A gas mixture consists of molecules of type 1, 2 and 3 with molar masses m1 > m2 > m3. vrms and <K> are the rms speed and average kinetic energy of the gas, respectively. Which of the following is true ?
Answer & explanation
Correct answer: option 1
The rms speed depends upon the molecular mass i.e.
\(v_{rms} \propto \frac{1}{\sqrt{M}}\)
but kinetic energy does not depend on it i.e.
E \(\propto\) m
In : m1 > m2 > m3
\(\Rightarrow \) vrms1 < vrms2 < vrms3 and <K>1 = <K>2 = <K>3