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Question 31073
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Kinetic Theory and Thermodynamics: Specific Heat MCQ

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Specific HeatHardQuestion 31073

Question

Molar heat capacity at constant pressure for water (liquid) is about 75 J/mol·K. This is much larger than 3R ≈ 25 J/mol·K for solids because:
  1. A
    Water molecules have lower mass
  2. B
    Water has additional rotational and vibrational modes plus hydrogen bonding interactions
    Correct
  3. C
    Pressure effects increase it
  4. D
    Water has anomalous thermal expansion

Correct answer

Water has additional rotational and vibrational modes plus hydrogen bonding interactions

Explanation

Water molecules have multiple vibrational modes and strong hydrogen bonds that absorb energy, giving a large Cp relative to simple solids.

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