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標題:

十萬火急的化學題.4

發問:

下列組合中，何者沸點較高？理由為何？ (A) O2(氧)與N2(氮) (B) SO2 與 CO2 (C) HF與HI

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(A) Nitrogen gas. Van der Waals' force is stronger in nitrogen gas (B) sulphur dioxide. sulphur dioxide has a V shape, which possess net dipole moment, which intensifies van der Waals' force. while CO2 has a linear shape, the net dipole moment is zero (C) HF. there is inter-molecular hydrogen bond in HF, which raise boiling pt. no H-bond in HI

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