Chemistry and Chemical Reactivity (9th Edition)

Vapor pressure depression and boiling point elevation are proportional to $i.m$ and assuming total ionic dissociation, i is the number of ions per compound: a) ethylene glycol (nonionic) 0.35 m b) sugar (nonionic) 0.50 m c) KBr $2\times 0.20\ m=0.40\ m$ d) Na2SO4 $3\times 0.20\ m=0.60\ m$ i) $d\lt b\lt c\lt a$ ii) $a\lt c\lt b\lt d$