The vapor pressures of four crystalline substances at 25 °C are listed below.
Substance Vapor pressure (mm Hg)
naphthalene 0.030
water (ice) 23.8
acetone (solid) 213
NaCl 1.0×10−12
Which substance would be expected to have the highest normal boiling point?
a) naphthalene
b) acetone
c) NaCl
d) water