Which refrigerant has the molecular formula C2H4F2?

The refrigerant with the molecular formula C2H4F2 is indeed R-152a. This refrigerant is a hydrofluorocarbon (HFC) that is often used as a refrigerant in various applications due to its favorable environmental properties and relatively low global warming potential compared to some other refrigerants.

To understand this better, it's essential to recognize that the molecular formula indicates the number of carbon, hydrogen, and fluorine atoms present in the compound. In the case of R-152a, it consists of 2 carbon atoms, 4 hydrogen atoms, and 2 fluorine atoms, which aligns perfectly with the provided molecular formula. R-152a is utilized as a refrigerant in applications such as commercial refrigeration and automotive air conditioning systems.

In contrast, the other refrigerants listed—R-123, R-134a, and R-22—have different molecular formulas, which do not match C2H4F2. R-123 (C2HCl2F) is a chlorofluorocarbon (CFC) used in some chillers, R-134a (C2H2F4) is widely recognized for automotive applications, and R-22 (CHClF2