Question

H2S is a gas while H2O is a liquid. why?

Answer 1

H2S (hydrogen sulfide) is a gas because at room temperature the forces and interactions between the molecules of hydrogen sulfide are very weak.

The water molecule has a stronger dipole (a negatively and positively charged end to the individual molecule) so these negative and positive ends continually attract each other like magnets of opposite poles, creating more cohesion between the molecules of water--explaining the liquid phase.

Answer 2

Hey !!

Due to small size and high electronegativity of oxygen, molecules of water are associated through hydrogen bonding, resulting in its liquid state. On the other hand, H₂S molecule are not assosicated through H-bonding. Hence, it is a gas.

Hope it helps you !!