[Casmira]

• Compare the properties of gaseous forms of Oxygen allotrope O2 and O3
Account for them on the basis of molecular structure and bonding


Oxygen | Ozone
Colorless | Colourless
Slightly soluble in water | Very soluble in water
Odourless | Pugnent smell
BP 184°C | BP 112°C

Oxygen is non polar and doesn’t form strong intermolecular bonds with water (polar) and is only slightly soluble. The BP of Oxygen is lower due to lower atomic mass of oxygen and less energy is needed to break these bonds.

Ozone is a bent, polar structure and is more soluble in water, ozone has a higher BP due to the polar nature and ozone will increase attraction between molecules and thus increase the BP.

Oxygen is very stable covalent bond and 493kJ mol-1 of energy is needed to break bonds of 1 mole of O2 molecules, Ozone only needs 1/3 that energy to break its bond, and ozone forms a free radical and Oxygen.


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From wikipedia:
"Ozone is a colorless gas at standard temperature and pressure. It forms a dark blue liquid below -112 °C and a dark blue solid below -193 °C. Ozone is a powerful oxidizing agent. It is also unstable, decaying to ordinary oxygen through the reaction:"

"Liquid O2 and solid O2 have a light blue color and both are highly paramagnetic. Liquid O2 is usually obtained by the fractional distillation of liquid air. [Oxygen gas is colourless]"