Which has the highest boiling point H2S or H2Se or H2O?

Answer 1

Water has the highest boiling point, as the hydrogen bonds between the molecules need more energy to break than the hdyrogen bonds in H2S, and H2Se, as Oxygen is much more electronegative than Sulphur of Selenium, so it makes the molecules more polar.

Answer 2

Hydrogen telluride (H2Te) has a higher boiling point than hydrogen sulfide, because the hydrogen telluride molecules have a higher molecular weight, and both the telluride and the sulfide are only weak hydrogen bonders, in contrast to water. Water has strong hydrogen bonding, which gives it a higher "effective" molecular weight than hydrogen sulfide, the unit that must be vaporized on boiling consisting on average of several water molecules rather than only one, as with the sulfide and telluride.

Answer 3

Oxygen has a higher electronegativity than sulfur, and therefore forms a more polar molecule, with a greater negative charge on the oxygen and a greater positive charge on the asymmetrically arranged hydrogen atoms. The polarity of the molecule is what causes water molecules to attract other water molecules and this to remain close together in a liquid phase, rather than flying apart into the gas phase. Hydrogen sulfide is less polar, and therefore has less intermolecular attraction.

Answer 4

Boiling point

• H2S : −60 °C (−76 °F; 213 K)
• H2Se : −41.25 °C (−42.25 °F; 231.90 K), which is 18.75 °C higher

(values from wikipedia - date: 09-09-2014)

Answer 5

HBr is has a higher boiling point

Answer 6

water does

Answer 7

H2Te