Which statement best explains why water has a higher boiling point than ethane? Ethane molecules are smaller than water and can move faster. Water molecules need relatively less heat energy to move. Water molecules form hydrogen bonds, which cannot be broken by heating water. Ethane molecules have no hydrogen bonds and need less energy to separate.

Question

Which statement best explains why water has a higher boiling point than ethane? Ethane molecules are smaller than water and can move faster. Water molecules need relatively less heat energy to move. Water molecules form hydrogen bonds, which cannot be broken by heating water. Ethane molecules have no hydrogen bonds and need less energy to separate.

Answer 1

The boiling point of a substance is the temperature at which its vapor pressure equals the external pressure surrounding the liquid. The boiling point of a substance is determined by the strength of the forces between its molecules. In the case of water, the molecules are held together by strong hydrogen bonds. These bonds require a significant amount of energy to break, which is why water has a higher boiling point than ethane. Ethane, on the other hand, does not have hydrogen bonds between its molecules, which means it requires less energy to separate its molecules, resulting in a lower boiling point.

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