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States of MatterMCQ

The normal boiling points of ammonia, water, and hydrogen fluoride increase in the order NH3 (bp = –States of Matter Chemistry Question

Question

The normal boiling points of ammonia, water, and hydrogen fluoride increase in the order NH3 (bp = –33 °C) < HF (bp = 19 °C) < H2O (bp = 100 °C). What is the best explanation for this ordering?

A.

H2O forms a greater number of hydrogen bonds per mol than NH3 or HF.

✓ Correct
B.

H2O forms stronger hydrogen bonds than NH3 or HF.

C.

H2O has a larger dipole moment than NH3 or HF.

D.

H2O has stronger London dispersion forces than NH3 or HF.

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