How do I predict the order in which these molecules will evaporate? ammonia, CH3CH(OH)CH3, O2, and C50H102

Expert Answers

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First let's separate the gasses from the liquids.  Ammonia and oxygen (O2) are gasses at standard temperature and pressure.  Between these two, ammonia (NH3) is much more polar than oxygen and so would have a higher boiling point than oxygen.  As far as the liquids are concerned, isopropanol (CH3CH(OH)CH3) is a much smaller compound than C50H102 (which is probably more like an oil than a free flowing liquid) and will have a lower boiling point as a result.  The order of boiling points from lowest to highest is:

O2<ammonia<CH3CH(OH)CH3<C50H102

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