Which of the following gas molecules have equal total kinetic energy and translational kinetic energy?

Question

Which of the following gas molecules have equal total kinetic energy and translational kinetic energy? (A) O 2 (B) He (C) CH 4 (D) N 2

Tardigrade Admin · Accepted Answer

The total kinetic energy of a molecule is the sum of its translational, vibrational and rotational kinetic energies. The monoatomic molecules do not possess vibrational and rotational kinetic energies. Hence noble gases (like He, Ar etc) fulfill the criteria.

Q. Which of the following gas molecules have equal total kinetic energy and translational kinetic energy?

$O_{2}$

$He$

$C H_{4}$

$N_{2}$

The total kinetic energy of a molecule is the sum of its translational, vibrational and rotational kinetic energies. The monoatomic molecules do not possess vibrational and rotational kinetic energies. Hence noble gases (like $He, A r$ etc) fulfill the criteria.