C2HF5

C2HF5 is the chemical formula for pentafluoroethane, a fluorinated hydrocarbon used primarily as a refrigerant. It is commonly referred to as pentafluoroethane or by its refrigerant designation R-125. The molecule consists of two carbon atoms connected by a single bond, with three fluorine atoms attached to one carbon (forming a CF3 group) and two fluorine atoms plus one hydrogen on the other carbon (forming CHF2). Overall, its formula is CF3-CHF2.

In terms of properties, C2HF5 is a colorless, volatile compound that is generally non-flammable and exists as a gas at standard conditions, though it is often handled as a liquid under pressure in refrigeration systems. It is thermally stable under normal operating conditions but decomposes at sufficiently high temperatures. Pentafluoroethane has a high global warming potential and zero ozone depletion potential, so its environmental impact is a major consideration in its use and regulation.

Applications of pentafluoroethane center on its role as a refrigerant. It is a component of common refrigerant blends, notably as R-125 in mixtures such as R-410A, where it contributes to system efficiency and performance. Because of its environmental profile, its production and use are subject to regulatory controls and phase-down schedules in many regions under international climate frameworks.

See also: R-125, hydrofluorocarbons, refrigerants.