# What is the bond polarity of h2s?

The short version: Sulfur is more electronegative than hydrogen, so the H-S bond is polar with electron higher on the sulfur atom. This leads to ##H_2S## being a polar molecule. However, the difference in polarity between H and S is very small, so neither the bond nor the molecule are very polar.

The longer version:
There is some controversy about this. The difference in electronegativities of hydrogen (2.20) and sulfur(2.58) is almost exactly the same as that between hydrogen and carbon (2.55). The C-H bond is viewed as non-polar and so, therefore, should the H-S bond. However, there is some polar character to a C-H bond. Its dipole moment is only 0.3 D, compared with 5.04 D for an OH bond.
We should therefore expect an H-S bond to have about the same dipole moment. Yet the measured molecular dipole moment of H₂S is 0.95 D. If this were due entirely to the polar S-H bonds, the S-H bond dipole must be about 0.8 D, with the negative end pointing to the S atom.
However, there is another explanation. Methane has a tetrahedral electron geometry, with two C-H bonds pointing to the lower left in the diagram and two C H bonds pointing to the upper left. Hydrogen sulfide has two S-H bonds pointing to the lower left. But, instead of two H atoms, there are now two lone pairs at the upper left.
Lone pairs contribute to the molecule’s dipole moment even though they do not constitute a ‘bond’. Clearly the sulfur ‘end’ of the lone pair is positive, and the electron ‘end’ is negative so one might think of a ‘lone pair dipole’ contributing to the polarity of the molecule in analogy to a bond dipole. Thus, it may be the lone pairs that make the major contribution to the polarity of the molecule.

## Calculate the price of your order

550 words
We'll send you the first draft for approval by September 11, 2018 at 10:52 AM
Total price:
\$26
The price is based on these factors:
Number of pages
Urgency
Basic features
• Free title page and bibliography
• Unlimited revisions
• Plagiarism-free guarantee
• Money-back guarantee
On-demand options
• Writer’s samples
• Part-by-part delivery
• Overnight delivery
• Copies of used sources
Paper format
• 275 words per page
• 12 pt Arial/Times New Roman
• Double line spacing
• Any citation style (APA, MLA, Chicago/Turabian, Harvard)

# Our guarantees

Delivering a high-quality product at a reasonable price is not enough anymore.
That’s why we have developed 5 beneficial guarantees that will make your experience with our service enjoyable, easy, and safe.

### Money-back guarantee

You have to be 100% sure of the quality of your product to give a money-back guarantee. This describes us perfectly. Make sure that this guarantee is totally transparent.

### Zero-plagiarism guarantee

Each paper is composed from scratch, according to your instructions. It is then checked by our plagiarism-detection software. There is no gap where plagiarism could squeeze in.

### Free-revision policy

Thanks to our free revisions, there is no way for you to be unsatisfied. We will work on your paper until you are completely happy with the result.