Environmental Protection Agency (EPA) MVAC Certification

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Prepare for the EPA MVAC Certification Exam with multiple-choice questions and detailed explanations. Boost your understanding and readiness for the EPA certification test!

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Which refrigerant has the molecular formula C2H4F2?

R-22
R-134a
R-152a
R-410A

The correct answer is: R-152a

The refrigerant with the molecular formula C2H4F2 is indeed R-152a. This refrigerant is characterized by its chemical structure, which consists of two carbon atoms, four hydrogen atoms, and two fluorine atoms. R-152a, known chemically as difluoroethane, is used in various refrigeration applications, and its properties enable it to serve as a replacement for some older refrigerants that may be more harmful to the environment. Understanding the molecular formula can help differentiate among refrigerants. For instance, R-134a, with the molecular formula C2H2F4, contains a different ratio of hydrogen and fluorine. R-22, which is chlorodifluoromethane (CClF2), contains chlorine and therefore has a distinct formula. Similarly, R-410A is a blend of two different refrigerants, R-32 and R-125, and does not match the formula for R-152a. R-152a is notable for its relatively low global warming potential compared to chlorofluorocarbons (CFCs) and some hydrofluorocarbons (HFCs), making it a more environmentally friendly option in many scenarios. Its usage