The Relationship Between the Vapor Pressure of a Liquid and Temperature

question 79

Multiple Choice

The relationship between the vapor pressure of a liquid and temperature can be expressed by the Clausius-Clapeyron equation:
Ln[P₂/P₁] = [Δ_vapH/R] × [1/T₁ - 1/T₂]
Ethanol (C₂H₅OH) has a normal boiling point of 78.3 °C and,with Δ_vapH = 39.3 kJ/mol.What is the vapor pressure of ethanol at 50.0 °C?

• A)118 Torr
• B)234 Torr
• C)354 Torr
• D)485 Torr
• E)670 Torr

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