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Question
As the molecular masses of hydrocarbons increase, their boiling points ______ and melting points ______.
Options
increase
decrease
Solution
As the molecular masses of hydrocarbons increase, their boiling points increase and melting points increase.
Explanation:
With an increase in molecular mass, hydrocarbons have stronger van der Waals forces, requiring more energy to break intermolecular bonds, leading to higher boiling and melting points.
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