Acetone Is a Fairly Volatile Liquid with a Vapor Pressure $\circ$

Acetone is a fairly volatile liquid with a vapor pressure of 0.299 atm at 25.0 ^$\circ$ C,and its normal boiling point is 56.5 ^$\circ$ C.Calculate an estimate of acetone's enthalpy of vaporization in kJ/mol.

A) "-31.3 kJ/mol"
B) "+31.3 kJ/mol"
C) "+309 kJ/mol"
D) "+13.6 kJ/mol"
E) "-13.6 kJ/mol"