Volcanoes and deep sea hydrothermal vents are both associated with sulfur-rich environments. Mount Etna is classed as a continuously degassing volcano and emissions of SO? and H2S are around 1.5 Tgy-1 and 100 Ggy-1, respectively (Tg = 1012g; Gg — 109g).
(a) Draw Lewis structures for H2S and SO2, ensuring that the octet rule is obeyed by the S and O atoms. Your answer must be consistent with the fact that in SO2, the two sulfur-oxygen bonds are the same length,
(b) Are H2S and SO2 polar or non-polar molecules? If polar, draw a diagram to show the direction of the molecular dipole moment,
(c) In the troposphere, SO2 reacts with HO* radicals. Construct an MO diagram for HO’ from H and O atoms, and deduce what you can about the bonding in HO*.
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