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(Die-kloor-oh-die-floor-oh-meth-ain)
Dichlorodifluoromethane (R-12), also known as Freon-12. It is a colorless gas that was used as a refrigerant and aerosol spray propellant until 1994, when its manufacture was banned in many countries due to concerns about damage to the ozone layer.
Molar mass = 120.91 g mol^(-1)
Density = 1.486 g/cm³ (-29.8 °C)