Question 15.3: (a) Determine the ASHRAE number designation for dichlorotetr......

Heating, Ventilating and Air Conditioning [987579]

(a) Determine the ASHRAE number designation for dichlorotetrafluoroethane,
$CClF_{2}CClF_{2}$ . (b) Give the chemical composition of R-11.

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(a) There are four fluorine atoms, no hydrogen atoms, and two carbon atoms per molecule:

(2 − 1) (0 + 1) (4)

Thus the ASHRAE designation is 114.

(b) R-11 should have one fluorine atom, no hydrogen atoms, and one carbon atom. The one carbon atom indicates a methane, and since there is only one fluorine atom and no hydrogen atoms, there must be three chlorine atoms to complete the structure. Thus R-11 is trichlorofluoromethane, or $CCl_{3}F$ .

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