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Question

Why does NH3 have a lower boiling point than H2O?


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Solution

Boiling point:-

  • The boiling point is defined as the temperature at which boiling starts for any compound and at that temperature vapour pressure of the compound becomes equal to the atmospheric pressure.
  • The boiling point depends on the two major factors type or strength of the bonding and the surface area of the compound.

Boiling point Comparison of NH3(ammonia) and H2O(Water)

  • Both the compounds is having hydrogen bonding in the molecule.
  • Hydrogen bonding is the interaction between more electronegative elements and Hydrogen.
  • Nitrogen is less electronegative than Oxygen and so a less strong Hydrogen bond will form in this case of NH3.
  • Hence, NH3 have lower boiling point than H2O.

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