Assuming that these species remain gaseous at 119K , for which species is the equipartition theorem prediction for the rotational contribution to the internal energy appropriate?

HCl (Rotational Temperature = 15.2K)

CO (Rotational Temperature = 2.78K)

KI (Rotational Temperature = 0.088K)

CsI (Rotational Temperature = 0.035K)

If these species were to remain gaseous at 1081K , for which species is the equipartition theorem prediction for the vibrational contribution to the internal energy is not appropriate?

HCl (Vibrational Temperature = 4150K)

CO (Vibrational Temperature = 3120K)

KI (Vibrational Temperature = 288K)

CsI (Vibrational Temperature = 173K)