Question

in a closed system at 40 C, a liquid has a vapor pressure of 50 KPa. the liquid's normal boiling point could be

(1)10 C
(2)30 C
(3)40 C
(4)60 C

Answer 1

Doesn't one need the heat of vaporization, then use the Clausius-Clapeyron equation?

Answer 2

60

Answer 3

It's 60 C for the reason of its must be higher then forty