Refrigerants that have a lowercase letter designation, such as R-134a, indicate which of the following?

Refrigerants that have a lowercase letter designation, such as R-134a, indicate which of the following?

• A. Element
• B. Mixture
• C. Isomer
• D. Purity

Answer: (C)

Lowercase suffixes after the refrigerant number point to a specific isomer of the same chemical formula. An isomer is a compound that has the same atoms in the same amounts but arranged differently in space, which can change properties like boiling point and pressure. This is why the letter is used: to distinguish one structural variant from another with the same formula. It’s not indicating an element, nor a mixture, and it doesn’t describe purity. So the designation signals an isomer.

Lowercase suffixes after the refrigerant number point to a specific isomer of the same chemical formula. An isomer is a compound that has the same atoms in the same amounts but arranged differently in space, which can change properties like boiling point and pressure. This is why the letter is used: to distinguish one structural variant from another with the same formula. It’s not indicating an element, nor a mixture, and it doesn’t describe purity. So the designation signals an isomer.