The Relationship Between the Vapor Pressure of a Liquid and Temperature

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