Why water has higher melting and boiling point as compared to H2S?

This is an account of intermolecular hydrogen bonding which is present in the molecules of H2O but is absent in the molecules of H2S. As a result, both melting and boiling point of water are higher than those of hydrogen sulphide.

Why H2S has a lower boiling point than H2O and h2se?

Water is more polar than hydrogen sulfide because the oxygen atom is more electronegative than the sulfur atom. Also, hydrogen sulfide has weaker intermolecular forces (dipole forces, vander waal’s forces) compared to water resulting in a lower melting point and boiling point.

Why does H2O have the highest boiling point?

Water has a higher boiling point because the hydrogen bonds that form among water molecules are stronger than the Van der Waals interactions among methane molecules, thus more energy must be provided in order to break the hydrogen bonds and allow the water molecules to escape the liquid state.

Why does water have high boiling and melting point compared to other molecules of same molecular weight?

In the table below, we see examples of these relationships. When comparing the structural isomers of pentane (pentane, isopentane, and neopentane), they all have the same molecular formula C5H12.

Why does H2O have a higher melting point than H2S?

Between water and hydrogen sulfide, both are polar, and have dipole-dipole forces, so they have higher boiling points than methane or silane. But water has hydrogen bonds, which are extra-strong dipole-dipole forces. Water boils much hotter than hydrogen sulfide.

Why H2O has higher boiling point than H2Se?

It’s due to the higher electronegativity of Oxygen than Sulphur that it makes Intermolecular Hydrogen bonds with the Hydrogen Atoms of Other water molecules thus the Boiling Point of H2O increases and is much higher than that of H2S.

Which has lowest boiling point H2O H2S?

H2S < H2Se < H2Te < H2O This is the correct boiling point order.

Why does water have a low melting and boiling point?

Relatively little energy is needed to overcome the intermolecular forces, so simple molecular substances have low melting and boiling points. The intermolecular forces between water molecules are stronger than those between oxygen molecules.

Does H2O have a high melting point?

32°F (0°C)
Water/Melting point

Which has higher boiling point H2O or H2S?

Water has a higher boiling point than hydrogen sulphide. The intermolecular attractions between water molecules are stronger than H2S molecules due to hydrogen bonding in H2O due to high electronegativity and small size of oxygen atom.

Why does water have a higher boiling point than ethanol?

Hydrogen bonding is stronger in water than in ethanol. Water needs higher energy to break those bonds. Hence, water has higher boiling point at same atmospheric pressure than ethanol.

Does H2O or H2S have a higher melting point?

When the bond length is larger, the bond is weaker because the atoms are further apart and therefore they can break apart easier. H2O has a bond length of about 1A and H2S has a bond length of about 2.8A. This is why H2O has a higher melting/boiling point, because its bond length is smaller than H2S’s.

Why does H2O have a higher boiling point than H2S?

It’s due to the higher electronegativity of Oxygen than Sulphur that it makes Intermolecular Hydrogen bonds with the Hydrogen Atoms of Other water molecules thus the Boiling Point of H2O increases and is much higher than that of H2S. Van der Waal forces between the molecules.

Why is the melting point of hydrogen sulfide higher than water?

Why is the melting point of water (0°C) higher than that of hydrogen sulphide (-83°C)? In short, because the intermolecular forces holding the molecules together in a rigid, solid structure are much weaker in hydrogen sulfide than in water.

What causes the boiling point of water to increase?

Hydrogen bonding between O and H of the adjacent water molecule. The Hydrogen bonds are pretty strong leading to a very high melting and boiling point compared to similar molecules.

What is the difference between H2S and H20?

Water (H20) has hydrogen bonding and London forces. Hydrogen sulfide (H2S) has only London forces. The reason why water has hydrogen bonding and hydrogen sulfide does not is because the oxygen in water is more electronegative than the sulfur in hydrogen sulfide.