Water, H2O, and methane, CH4, have about the same mass and differ by only one type of atom. Why is the boiling point of water so much higher than that of methane?
A. The oxygen of a water molecule has two lone pairs of electrons.
B. The electronegativity difference between oxygen and hydrogen is greater than the electronegativity difference between carbon and hydrogen.
C. The water molecule is less symmetrical than in the methane molecule.
D. all of the above
Answer: D
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