Which of the following substances would you predict to have the highest δhvap?

Which of the following substances would you predict to have the highest ?Hvap? if you can please exaplain why? is the highest Hvap the highest molecular mass?

A) Rn
B) C6H6
C) SiF4
D) Br2
E) H2

Answer

Answer: The heat of vaporization is a measure of Molecular Association. Stronger the molecular association, larger will be the Heat of Vaporization. For the polar molecules Molecular Association is always strong and hence Heat of vaporization is always larger for polar molecules. Of the given choices SiF4 is most polar compound because there is the huge difference between electronegativity of Si & F making Si-F bond polar and so the molecule. And hence will have highest Heat of vaporization value. Answer option: C) SiF4.

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