1) Considering their intermolecular forces, place the following gases in order of boiling
points. Starting with the lowest boiling point first, giving reasons for your answer
CH4, He, HF, Ne
2) A compound exhibits a vapor pressure of 760 mmHg at 21oC and 960 mmHg at 100oC.
What is Hvap of this substance?
1. Gases with increasing boiling point: He, Ne, CH4 and HF
2. Hvap = 960 mmHg
Explanation: Hvap is the vapor pressure at 100 C
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