Kinetic Molecular Theory Of Gases

A triatomic molecule can rotate about any of three co-ordinate axes. The molecule of a triatomic gas has a tendency of rotating about any of three co-ordinate axes. So, it has degrees of freedom, translational and rotational. At high enough temperature, a triatomic molecule has vibrational degrees of freedom. But as temperature requirement is not given, so we answer simply by assuming triatomic gas molecule at room temperature. Thus, ( translational rotational) at room temperature.