Calculate the rotational partition function of \(\mathrm{SO}_{2}\) at 298 K from its rotational constants \(2.02736 \mathrm{~cm}^{-1}\), \(0.34417 \mathrm{~cm}^{-1}\), and \(0.293535 \mathrm{~cm}^{-1}\) and use your result to calculate the rotational contribution to the molar entropy of sulfur dioxide at \(25^{\circ} \mathrm{C}\).
Text Transcription:
SO_2
2.02736 cm^-1
0.34417 cm^-1
0.293535 cm^-1
25^circ C
CHE 112 Notes Week of February 11, 2018 Inter- vs. Intramolecular Forces Intermolecular forces are the forces that are attractive between molecules “Measure” of: o Boiling Pt. o Melting Pt. o ∆ Hvap o ∆ H fus o ∆ H¿ Intramolecular holds atoms together in a molecule Dipole-Dipole Forces These are intermolecular forces, but between polar molecules. Solid: Particles arranged by charges. The positive side is closest to the negative side of the molecule next to it. All molecules in a row are in the same direction. No ions Ion-Dipole Forces Between polar molecules and ions Not polarizable Ion-Induced dipole Temporary Polarizable Hydrogen Bond This bond consists of a hydrogen atom bonded to an oxygen, fluorine, or nitrogen atom. Intermolecular Hydrogen Bond is an attraction between the Hydrogen of one atom and the oxygen, fluorine, or nitrogen atom of another molecule. These bonds have a much higher boiling point than Hydrogen paired with other atoms in the same group. No ions Polarizability and Induced Dipoles A nearby cloud of an atom can distort the electron cloud of another atom, ion, or molecule. If nonpolar, a temporary dipole moment is created. If polar, it enhances the existing dipole moment. Polarizability is how easy the electron cloud can be distorted. Increases down a group due to the atomic size increasi
