Ethanol Has an Enthalpy of Vaporization of 42

question 21

Multiple Choice

Ethanol has an enthalpy of vaporization of 42.3 kJ/mol.The compound has a vapor pressure of 1.00 atm at 78.3 °C.At what temperature is the vapor pressure equal to 0.800 atm? (R = 8.314 J/K ⋅ mol)

• A) -83.8 °C
• B) -24.4 °C
• C) 62.6 °C
• D) 73.0 °C
• E) 78.0 °C

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