Data for the boiling point of the pure liquid at 760 and at 400 torr (ref 2) was used to determine the heat of vaporization.
(Data for the boiling point of the pure liquid at 760; was used; to determine the heat of vaporization; T:at 400 torr)
Data for the boiling point of the pure liquid at 760
was used
to determine the heat of vaporization T:at 400 torr