Abstract
Hexachlorethane.-C 2 Cl 6 . Molecular weight, 236·76. This substance is typical of the halogen derivatives of ethane and will therefore be considered in some detail. Trimorphism .-C 2 Cl 6 is orthorhombic at ordinary temperatures, but at about 46°C, it changes over to a triclinic form and at 71° the triclinic form becomes cubic. The process is reversible:— Rhombic 45·1 - 46·643·1 triclinic 71·171·1 cubic.

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