The temperature at which a liquid boils is the boiling point of the liquid. The
ID: 1005104 • Letter: T
Question
The temperature at which a liquid boils is the boiling point of the liquid. The boiling point is an indication of the intermolecular forces that hold the matter in the liquid state. Water, H2O, boils at 100°C. Ethanol, C2H6O boils at 78°C. Ammonia, NH3, boils at -33°C. Which one of the following ranks the intermolecular forces in these liquids from the strongest to the weakest? Water > Ammonia > Ethanol Water > Ethanol > Ammonia Ammonia > Ethanol > Water Ethanol > Water > Ammonia
Explanation / Answer
The molecules in a liquid are able to slide past each other. A high temperature gives the molecules enough kinetic energy to break away and escape into the gas phase. Liquids with strong intermolecular forces have higher boiling points.
Higher intermolecular forces === > Higher boiling points
Since from the given boiling points , intermolecular forces are arranged in the order of
Water > Ethanol > Ammonia
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