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The reason H2S exists as a gas while H2O exists as a liquid at room temperature is because:
H2S has more electrons than H2O, causing a larger dispersion.
H2O has a lower boiling point than H2S.
H2S possesses hydrogen bonds, while H2O only possesses London dispersion forces.
H2O possesses hydrogen bonding, while H2S does not.

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Greenleafable
The reason H2S exists as a gas while H2O exists as a liquid at room temperature is because H2O possesses hydrogen bonding, while H2S does not.
I'd say that the last option is correct.

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