Question

Chloroflurocarbons (CFCs) are no longer used as refrigerants because they help destroy the ozone layer. Trichlorofluoromethane (CCl3F) boils are 23.8C and its molar heat of vaporization is 24.8 kj/mol. Calculate the molar entropy of evaporation of CC3F (l)

Answer 1

83.60 J/k mol

Step-by-step explanation:

The molar entropy of vaporization,ΔS vap is given by the expression:

ΔS vap = ΔHvap / Tb where

ΔHvap = molar enthalpy change of vaporization, J/mol

Tb = boiling temperature, K

We have both ΔHvap, and Tb so lets solve our question.

T= (23.8 + 273) = 296.8 K

ΔHvap = 24.8 kJ = 24.8 x 10³ J

ΔS vap = ΔHvap / Tb = 24.8 x 10³ J/mol / 296.8 K = 83.6 J/k mol