Freon-113, C2Cl3F3, has an enthalpy of vaporization of 27.04 kJ/mol and a normal boiling point of 48 C. At what temperature is the vapor pressure of Freon-113 equal to 76.0 mmHg? (R = 8.31 J/mol*K) Answer is -11.4 C, please show steps.  I keep getting 143.5 C

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