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Is H2S Polar or Nonpolar?
Hydrogen sulfide has a bent geometry with a 92° bond angle, similar to water. Sulfur (2.58) is more electronegative than hydrogen (2.20), creating polar S–H bonds. The bent shape prevents cancellation of the dipoles, giving H2S a dipole of 0.97 D — weaker than water because the electronegativity difference is smaller.
Why is H2S Polar?
Hydrogen sulfide has a bent geometry with a 92° bond angle, similar to water. Sulfur (2.58) is more electronegative than hydrogen (2.20), creating polar S–H bonds. The bent shape prevents cancellation of the dipoles, giving H2S a dipole of 0.97 D — weaker than water because the electronegativity difference is smaller.
- Electronegativity difference: S (2.58) is significantly more electronegative than H (2.2), creating partial charges on each atom and making the individual bonds polar.
- Bent shape (92°): The asymmetric molecular geometry means the bond dipoles point in directions that do not cancel — they add up to produce a net dipole moment of 0.97 D.
- Net dipole moment (0.97 D): Any molecule with a nonzero net dipole moment is classified as polar. The 0.97 D dipole moment of H2S confirms its polar character.
Molecular Geometry of H2S
H2S has a bent molecular geometry with a bond angle of 92°. Here is why this shape determines polarity:
- The central atom's electron pairs arrange themselves to minimize repulsion, resulting in the bent shape.
- The 92° bond angle creates an asymmetric arrangement — the bond dipoles point in directions that do not perfectly oppose each other.
- Asymmetry is the key: if H2S had a perfectly symmetric geometry, its bond dipoles would cancel and the molecule would be nonpolar. The bent shape prevents this cancellation.
Electronegativity and Polarity
Electronegativity measures how strongly an atom attracts bonding electrons. A difference greater than ~0.5 on the Pauling scale generally means the bond is polar.
In H2S:
- S (central atom) electronegativity: 2.58
- H (outer atom) electronegativity: 2.2
- Difference: 0.38 — below the ~0.5 threshold, so the S–H bonds are only weakly polar
The combination of polar bonds and an asymmetric bent geometry means the partial charges do not cancel — making H2S a polar molecule with a net dipole of 0.97 D.
Is H2S Polar or Nonpolar? (Quick Answer)
H2S (Hydrogen Sulfide) is polar. H2S is a polar molecule because its bent geometry and the electronegativity difference between sulfur and hydrogen create a net dipole moment of 0.97 D.
Frequently Asked Questions
Is H2S polar or nonpolar?
H2S is a polar molecule because its bent geometry and the electronegativity difference between sulfur and hydrogen create a net dipole moment of 0.97 D.
Why is Hydrogen Sulfide polar?
Hydrogen sulfide has a bent geometry with a 92° bond angle, similar to water. Sulfur (2.58) is more electronegative than hydrogen (2.20), creating polar S–H bonds. The bent shape prevents cancellation of the dipoles, giving H2S a dipole of 0.97 D — weaker than water because the electronegativity difference is smaller.
What is the shape of H2S?
H2S has a bent molecular geometry with a bond angle of 92°. This shape results in an asymmetric charge distribution and a net dipole moment of 0.97 D, making the molecule polar.
Does H2S have a dipole moment?
Yes. H2S has a dipole moment of 0.97 D. Its bent geometry and polar bonds combine to produce a net dipole, confirming its polar character.