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What is the bond angle in the H2O molecule?

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Question: What is the bond angle in the H2O molecule?

Options:

  1. 90 degrees
  2. 104.5 degrees
  3. 120 degrees
  4. 180 degrees

Correct Answer: 104.5 degrees

Solution: 

The bond angle in H2O is approximately 104.5 degrees due to the bent shape of the molecule caused by the two lone pairs on the oxygen atom.

What is the bond angle in the H2O molecule?

Practice Questions

Q1
What is the bond angle in the H2O molecule?
  1. 90 degrees
  2. 104.5 degrees
  3. 120 degrees
  4. 180 degrees

Questions & Step-by-Step Solutions

What is the bond angle in the H2O molecule?
  • Step 1: Understand that H2O is a water molecule made of two hydrogen atoms and one oxygen atom.
  • Step 2: Know that the shape of the H2O molecule is bent, not straight.
  • Step 3: Recognize that the oxygen atom has two lone pairs of electrons that push down on the hydrogen atoms.
  • Step 4: Learn that this pushing creates an angle between the hydrogen atoms.
  • Step 5: Find out that the bond angle in H2O is approximately 104.5 degrees.
  • Molecular Geometry – Understanding the shape of molecules based on VSEPR theory, which explains how electron pairs influence bond angles.
  • Lone Pairs – Recognizing the effect of lone pairs on the central atom in determining the bond angle and molecular shape.
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