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Ammonia is a colourless gas with a characteristic pungent smell. It is lighter than air, its density being 0.589 times that of air. It is easily liquefied due to the strong hydrogen bonding between molecules; the liquid boils at â33.3 Â°C (â27.94 Â°F), and freezes at â77.7 Â°C (â107.86 Â°F) to white crystals.
The ammonia molecule contains three identical reflection planes. All are designated as vertical symmetry planes (Ïv) because they contain the principle rotation axis. The water molecule contains two different reflection planes. And benzene contains a total of seven reflection planes, one horizontal plane (Ïh) and six vertical planes (Ïv and Ïd).