CFC-11 (trichlorofluoromethane,CCl₃F)has been used for many years as the working fluid in refrigerators.Given its heat of vaporization is 26.88 kJ/mol and its entropy of vaporization is 90.51 J/(mol ∙ K),what is the boiling point of CFC-11? A)-272.9°C B)0.297°C C)2.44°C D)23.8°C

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Quizplus · Accepted Answer

The boiling point of CFC-11 can be calculated using the Clausius-Clapeyron equation, which relates the heat of vaporization ($\Delta H_{vap}$) and the entropy of vaporization ($\Delta S_{vap}$) to the boiling point ($T_b$) at 1 atm pressure. The equation in a simplified form for boiling point calculation is $T_b = \frac{\Delta H_{vap}}{\Delta S_{vap}}$. Given $\Delta H_{vap} = 26.88 \, \text{kJ/mol} = 26880 \, \text{J/mol}$ and $\Delta S_{vap} = 90.51 \, \text{J/(mol} \cdot \text{K)}$, the boiling point $T_b$ is calculated as $T_b = \frac{26880 \, \text{J/mol}}{90.51 \, \text{J/(mol} \cdot \text{K)}} = 297 \, \text{K}$. To convert to degrees Celsius, subtract 273.15 from the Kelvin temperature, resulting in $23.85^\circ C$, which rounds to $23.8^\circ C$.

CFC-11 (Trichlorofluoromethane,CCl3F)has Been Used for Many Years as the Working

CFC-11 (Trichlorofluoromethane,CCl₃F)has Been Used for Many Years as the Working