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Given that the boiling point of H2O is 373 K, what would you expect the boiling point of H2S to be?

1. Greater than 300 K but less than 373 K
2. Less than 300 K
3. Equal to 373 K
4. More than 373 K

Correct answer: Less than 300 K

Solution

Because H2S cannot form the strong hydrogen bonds that water does, its boiling point is anomalously low (about 213 K, i.e. -60 deg C), which is less than 300 K.

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