A picometer (pm) is equal to 1 x 10^-12 m. The O-H bond lengths in water are 95.8 pm,while S-H bond lengths in dihydrogen sulfide are 135 pm. Why are S-H bonds longer than O-H bonds?
Is it because Sulfurs mass is greater than Oxygens mass?
Please correct me if I'm wrong.
Oxygen = 15.99
Sulfur = 32.06
Answer is wrong
yall are wrong
Yes, you're correct. The reason S-H bonds are longer than O-H bonds is due to the difference in atomic masses of sulfur and oxygen. Atomic mass is a measure of the average mass of atoms in a sample, and it is often expressed in atomic mass units (amu) or grams per mole.
In this case, oxygen has an atomic mass of 15.99 amu, while sulfur has an atomic mass of 32.06 amu. Since sulfur is heavier than oxygen, it has a larger atomic radius. The atomic radius of an element refers to the size of its atoms, and it is measured from the nucleus to the outermost electron orbital.
The larger atomic radius of sulfur leads to a longer S-H bond length compared to the O-H bond length in water. When two atoms form a chemical bond, their atomic orbitals overlap to create a shared electron density. Since sulfur atoms are larger, their orbitals extend farther from the nucleus, resulting in longer bond lengths.
Therefore, the difference in atomic masses between sulfur and oxygen is indeed one of the contributing factors to the longer S-H bond lengths in dihydrogen sulfide compared to the O-H bond lengths in water.